uW: fix the top core-die spacing to match l/r/b 10um

Signed-off-by: Matt Liberty <mliberty@precisioninno.com>

Author: maliberty

flow/designs/sky130hd/microwatt/config.mk

@@ -9,7 +9,7 @@ export VERILOG_FILES = $(sort $(wildcard $(DESIGN_HOME)/src/$(DESIGN_NICKNAME)/*
 export SDC_FILE      = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint.sdc
 
 export DIE_AREA   = 0 0 3020 3610
-export CORE_AREA  = 10 10 3010 3610
+export CORE_AREA  = 10 10 3010 3600
 
 export PLACE_DENSITY ?= 0.2