lef: Fixing VNB/VPB properties in .magic.lef files.

Both the `PIN VNB` and `PIN VPB` are now marked with `DIRECTION INOUT`.
The `PIN VNB` is marked with `USE GROUND` and the `PIN VPB` is marked
with `USE POWER`.

This should fix the `.magic.lef` file usage with OpenROAD (and hopefully other
tools too).

Fixes https://github.com/google/skywater-pdk/issues/172

Signed-off-by: Tim 'mithro' Ansell <tansell@google.com>

cells/tap/sky130_fd_sc_hs__tap_1.magic.lef

diff --git a/cells/tap/sky130_fd_sc_hs__tap_1.magic.lef b/cells/tap/sky130_fd_sc_hs__tap_1.magic.lef
index a2441f4..157ed83 100644
--- a/cells/tap/sky130_fd_sc_hs__tap_1.magic.lef
+++ b/cells/tap/sky130_fd_sc_hs__tap_1.magic.lef
@@ -39,6 +39,8 @@
     PORT
       LAYER li1 ;
         RECT 0.090000 0.265000 0.390000 1.440000 ;
+      LAYER pwell ;
+        RECT 0.155000 0.320000 0.325000 1.145000 ;
     END
     PORT
       LAYER pwell ;
@@ -51,6 +53,8 @@
     PORT
       LAYER li1 ;
         RECT 0.090000 1.890000 0.390000 3.065000 ;
+      LAYER nwell ;
+        RECT -0.190000 1.660000 0.670000 3.520000 ;
     END
   END VPB
   PIN VPWR
@@ -68,8 +72,6 @@
     LAYER mcon ;
       RECT 0.155000 -0.085000 0.325000 0.085000 ;
       RECT 0.155000  3.245000 0.325000 3.415000 ;
-    LAYER nwell ;
-      RECT -0.190000 1.660000 0.670000 3.520000 ;
   END
 END sky130_fd_sc_hs__tap_1
 END LIBRARY

cells/tap/sky130_fd_sc_hs__tap_2.magic.lef

diff --git a/cells/tap/sky130_fd_sc_hs__tap_2.magic.lef b/cells/tap/sky130_fd_sc_hs__tap_2.magic.lef
index b61b997..9402f05 100644
--- a/cells/tap/sky130_fd_sc_hs__tap_2.magic.lef
+++ b/cells/tap/sky130_fd_sc_hs__tap_2.magic.lef
@@ -39,6 +39,8 @@
     PORT
       LAYER li1 ;
         RECT 0.090000 0.265000 0.870000 1.440000 ;
+      LAYER pwell ;
+        RECT 0.155000 0.320000 0.805000 1.145000 ;
     END
     PORT
       LAYER pwell ;
@@ -51,6 +53,8 @@
     PORT
       LAYER li1 ;
         RECT 0.090000 1.890000 0.870000 3.065000 ;
+      LAYER nwell ;
+        RECT -0.190000 1.660000 1.150000 3.520000 ;
     END
   END VPB
   PIN VPWR
@@ -70,8 +74,6 @@
       RECT 0.155000  3.245000 0.325000 3.415000 ;
       RECT 0.635000 -0.085000 0.805000 0.085000 ;
       RECT 0.635000  3.245000 0.805000 3.415000 ;
-    LAYER nwell ;
-      RECT -0.190000 1.660000 1.150000 3.520000 ;
   END
 END sky130_fd_sc_hs__tap_2
 END LIBRARY

cells/tapmet1/sky130_fd_sc_hs__tapmet1_2.magic.lef

diff --git a/cells/tapmet1/sky130_fd_sc_hs__tapmet1_2.magic.lef b/cells/tapmet1/sky130_fd_sc_hs__tapmet1_2.magic.lef
index 3c611bd..57cd1e1 100644
--- a/cells/tapmet1/sky130_fd_sc_hs__tapmet1_2.magic.lef
+++ b/cells/tapmet1/sky130_fd_sc_hs__tapmet1_2.magic.lef
@@ -39,6 +39,8 @@
     PORT
       LAYER met1 ;
         RECT 0.080000 0.425000 0.400000 0.685000 ;
+      LAYER pwell ;
+        RECT 0.155000 0.320000 0.805000 1.145000 ;
     END
     PORT
       LAYER pwell ;
@@ -57,6 +59,8 @@
     PORT
       LAYER met1 ;
         RECT 0.560000 2.645000 0.880000 2.905000 ;
+      LAYER nwell ;
+        RECT -0.190000 1.660000 1.150000 3.520000 ;
     END
   END VPB
   PIN VPWR
@@ -78,8 +82,6 @@
       RECT 0.155000  3.245000 0.325000 3.415000 ;
       RECT 0.635000 -0.085000 0.805000 0.085000 ;
       RECT 0.635000  3.245000 0.805000 3.415000 ;
-    LAYER nwell ;
-      RECT -0.190000 1.660000 1.150000 3.520000 ;
   END
 END sky130_fd_sc_hs__tapmet1_2
 END LIBRARY

cells/tapvgnd/sky130_fd_sc_hs__tapvgnd_1.magic.lef

diff --git a/cells/tapvgnd/sky130_fd_sc_hs__tapvgnd_1.magic.lef b/cells/tapvgnd/sky130_fd_sc_hs__tapvgnd_1.magic.lef
index 7d23562..eddbf74 100644
--- a/cells/tapvgnd/sky130_fd_sc_hs__tapvgnd_1.magic.lef
+++ b/cells/tapvgnd/sky130_fd_sc_hs__tapvgnd_1.magic.lef
@@ -31,6 +31,8 @@
     PORT
       LAYER met1 ;
         RECT 0.000000 -0.245000 0.480000 0.245000 ;
+      LAYER pwell ;
+        RECT 0.155000 0.320000 0.325000 1.145000 ;
     END
   END VGND
   PIN VPB
@@ -39,6 +41,8 @@
     PORT
       LAYER met1 ;
         RECT 0.080000 2.645000 0.400000 2.905000 ;
+      LAYER nwell ;
+        RECT -0.190000 1.660000 0.670000 3.520000 ;
     END
   END VPB
   PIN VPWR

cells/tapvgnd2/sky130_fd_sc_hs__tapvgnd2_1.magic.lef

diff --git a/cells/tapvgnd2/sky130_fd_sc_hs__tapvgnd2_1.magic.lef b/cells/tapvgnd2/sky130_fd_sc_hs__tapvgnd2_1.magic.lef
index 0a2ad94..c56a791 100644
--- a/cells/tapvgnd2/sky130_fd_sc_hs__tapvgnd2_1.magic.lef
+++ b/cells/tapvgnd2/sky130_fd_sc_hs__tapvgnd2_1.magic.lef
@@ -31,6 +31,8 @@
     PORT
       LAYER met1 ;
         RECT 0.000000 -0.245000 0.480000 0.245000 ;
+      LAYER pwell ;
+        RECT 0.155000 0.320000 0.325000 1.145000 ;
     END
   END VGND
   PIN VPB
@@ -39,6 +41,8 @@
     PORT
       LAYER met1 ;
         RECT 0.080000 2.275000 0.400000 2.535000 ;
+      LAYER nwell ;
+        RECT -0.190000 1.660000 0.670000 3.520000 ;
     END
   END VPB
   PIN VPWR

cells/tapvpwrvgnd/sky130_fd_sc_hs__tapvpwrvgnd_1.magic.lef

diff --git a/cells/tapvpwrvgnd/sky130_fd_sc_hs__tapvpwrvgnd_1.magic.lef b/cells/tapvpwrvgnd/sky130_fd_sc_hs__tapvpwrvgnd_1.magic.lef
index 6afda6e..bf79885 100644
--- a/cells/tapvpwrvgnd/sky130_fd_sc_hs__tapvpwrvgnd_1.magic.lef
+++ b/cells/tapvpwrvgnd/sky130_fd_sc_hs__tapvpwrvgnd_1.magic.lef
@@ -31,6 +31,8 @@
     PORT
       LAYER met1 ;
         RECT 0.000000 -0.245000 0.480000 0.245000 ;
+      LAYER pwell ;
+        RECT 0.155000 0.320000 0.325000 1.145000 ;
     END
   END VGND
   PIN VPWR
@@ -39,6 +41,8 @@
     PORT
       LAYER met1 ;
         RECT 0.000000 3.085000 0.480000 3.575000 ;
+      LAYER nwell ;
+        RECT -0.190000 1.660000 0.670000 3.520000 ;
     END
   END VPWR
   OBS