flow: platforms: ihp-sg13g2: Increase CORE_MARGIN by 1um

Since the routing direction changed, pins at the macro edge and
power ring vias might be too close to each other.

Increase the core margin by 1um to prevent this issue.

Signed-off-by: Daniel Schultz <[email protected]>

Author: dnltz

flow/platforms/ihp-sg13g2/config.mk

@@ -93,7 +93,7 @@ export IO_PLACER_H ?= Metal3
 export PDN_TCL ?= $(PLATFORM_DIR)/pdn.tcl
 
 # To allow the core rings to fit inside the core area
-export CORE_MARGIN ?= 16.5
+export CORE_MARGIN ?= 17.5
 
 # There are no Endcap and Welltie cells in this PDK, so
 # `cut_rows` has to be called from the tapcell script.