gm45: Set default VGA PCIID.

Change-Id: I2eba1ca27c1f8181a9c6288f6794922915575790
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/6586
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/northbridge/intel/gm45/Kconfig

@@ -34,4 +34,8 @@ config BOOTBLOCK_NORTHBRIDGE_INIT
 	string
 	default "northbridge/intel/gm45/bootblock.c"
 
+config VGA_BIOS_ID
+	string
+	default "8086,2a42"
+
 endif