nb/intel/gm45/gm45.h: Remove duplicated include

Change-Id: Iabd6c69cd4c28f0015d4cf1f95d5ae0b6dc8b47e
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49568
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jacob Garber <jgarber1@ualberta.ca>

src/northbridge/intel/gm45/gm45.h

@@ -164,8 +164,6 @@ enum {
 #define CMOS_READ_TRAINING	0x80 /* 16 bytes */
 #define CMOS_WRITE_TRAINING	0x90 /* 16 bytes (could be reduced to 10 bytes) */
 
-#include "memmap.h"
-
 /*
  * D0:F0
  */