Merge pull request #3000 from The-OpenROAD-Project-staging/gf12-bp_dual-plc-density

lowered bp_dual place density to get around grt congestion

Author: vvbandeira

flow/designs/gf12/bp_dual/config.mk

@@ -59,7 +59,7 @@ export CORE_AREA = 200 200 2800 2800
 export ABC_CLOCK_PERIOD_IN_PS = 1250
 
 export TNS_END_PERCENT = 0
-export PLACE_DENSITY = 0.55
+export PLACE_DENSITY = 0.50
 
 export MACRO_WRAPPERS = $(PLATFORM_DIR)/bp/wrappers/wrappers.tcl