arch/x86: Remove <arch/cbfs.h>

There are no symmetrical headerfiles for other arch/ and
after ROMCC_BOOTBLOCK and walkcbfs() removal this file
ended up empty.

Change-Id: Ice3047630ced1f1471775411b93be6383f53e8bb
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37886
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>

src/northbridge/intel/haswell/raminit.c

@@ -17,7 +17,6 @@
 #include <console/usb.h>
 #include <string.h>
 #include <cbmem.h>
-#include <arch/cbfs.h>
 #include <cbfs.h>
 #include <cf9_reset.h>
 #include <ip_checksum.h>