add Implant layers to asap7 tech

Signed-off-by: LucasYuki <[email protected]>

Author: LucasYuki

test/asap7/asap7_tech_1x_201209.lef

@@ -59,6 +59,31 @@ END PROPERTYDEFINITIONS
 #  TYPE OVERLAP ;
 #END OVERLAP
 #
+
+LAYER LVTN
+  TYPE IMPLANT ;
+END LVTN
+
+LAYER LVTP
+  TYPE IMPLANT ;
+END LVTP
+
+LAYER RVTN
+  TYPE IMPLANT ;
+END RVTN
+
+LAYER RVTP
+  TYPE IMPLANT ;
+END RVTP
+
+LAYER SLVTN
+  TYPE IMPLANT ;
+END SLVTN
+
+LAYER SLVTP
+  TYPE IMPLANT ;
+END SLVTP
+
 LAYER nwell
   TYPE MASTERSLICE ;
  PROPERTY LEF58_TYPE "TYPE NWELL ;" ;