Fix `ANTENNADIFFAREA` for the `gf180mcu_fd_sc_mcu9t5v0__antenna` cell.

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

cells/antenna/gf180mcu_fd_sc_mcu9t5v0__antenna.lef

diff --git a/cells/antenna/gf180mcu_fd_sc_mcu9t5v0__antenna.lef b/cells/antenna/gf180mcu_fd_sc_mcu9t5v0__antenna.lef
index 5aec26c..acc051a 100644
--- a/cells/antenna/gf180mcu_fd_sc_mcu9t5v0__antenna.lef
+++ b/cells/antenna/gf180mcu_fd_sc_mcu9t5v0__antenna.lef
@@ -21,7 +21,7 @@
   SIZE 1.12 BY 5.04 ;
   PIN I
     DIRECTION INPUT ;
-    gf180mcu_fd_sc_mcu9t5v0__antennaDIFFAREA 0.4068 ;
+    ANTENNADIFFAREA 0.4068 ;
     PORT
       LAYER Metal1 ;
         POLYGON 0.15 1.315 0.475 1.315 0.475 3.215 0.15 3.215  ;