src: Remove unused 'include <bootmode.h>'

Change-Id: I658023f7c3535a2cddd8e11ca8bebe20ae53ffb0
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41670
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/skylake/chip.c

@@ -1,6 +1,5 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-#include <bootmode.h>
 #include <bootstate.h>
 #include <cbmem.h>
 #include <fsp/api.h>