src: Remove unneeded include <cbfs.h>

Change-Id: Iab0bd1c5482331a0c048a05ab806bf5c4dbda780
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/29303
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/drivers/spi/spi_flash.c

@@ -10,7 +10,6 @@
 #include <arch/early_variables.h>
 #include <assert.h>
 #include <boot_device.h>
-#include <cbfs.h>
 #include <cpu/x86/smm.h>
 #include <delay.h>
 #include <rules.h>