Removed the diode cell CDL files for sky130_fd_sc_hd, which are
currently in the Google/SkyWater repository.

sky130/custom/sky130_fd_sc_hd/scs8hd_diode_1.cdl

diff --git a/sky130/custom/sky130_fd_sc_hd/scs8hd_diode_1.cdl b/sky130/custom/sky130_fd_sc_hd/scs8hd_diode_1.cdl
deleted file mode 100644
index 2ae2f88..0000000
--- a/sky130/custom/sky130_fd_sc_hd/scs8hd_diode_1.cdl
+++ /dev/null
@@ -1,7 +0,0 @@
-* Additional subcircuits not in the vendor CDL library
-
-.SUBCKT scs8hd_diode_1 DIODE vgnd vnb vpb vpwr
-*.PININFO DIODE:I vgnd:I vnb:I vpb:I vpwr:I
-* NOTE:  Tap diode is not represented here.
-.ENDS
-

sky130/custom/sky130_fd_sc_hd/scs8hd_diode_2.cdl

diff --git a/sky130/custom/sky130_fd_sc_hd/scs8hd_diode_2.cdl b/sky130/custom/sky130_fd_sc_hd/scs8hd_diode_2.cdl
deleted file mode 100644
index 2abb8b4..0000000
--- a/sky130/custom/sky130_fd_sc_hd/scs8hd_diode_2.cdl
+++ /dev/null
@@ -1,6 +0,0 @@
-* Additional subcircuits not in the vendor CDL library
-
-.SUBCKT scs8hd_diode_2 DIODE vgnd vnb vpb vpwr
-*.PININFO DIODE:I vgnd:I vnb:I vpb:I vpwr:I
-* NOTE:  Tap diode is not represented here.
-.ENDS