Use previous default targetRC for specific design triggering antenna check error

This specific change should be remove after antenna check is fixed

Signed-off-by: Augusto Berndt <[email protected]>

Author: gudeh

flow/designs/sky130hs/ibex/config.mk

@@ -44,3 +44,5 @@ export SDC_FILE      = ./designs/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint.sdc
 export CORE_UTILIZATION = 45
 export PLACE_DENSITY_LB_ADDON = 0.2
 export TNS_END_PERCENT = 100
+
+export GPL_TARGET_RC = 1.25