src: Drop unused 'include <cbfs.h>'

Change-Id: If5c5ebacd103d7e1f09585cc4c52753b11ce84d0
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31953
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/arch/x86/mmap_boot.c

@@ -14,7 +14,6 @@
  */
 
 #include <boot_device.h>
-#include <cbfs.h>
 #include <endian.h>
 #include <stdlib.h>