src: Remove unused 'include <cpu/x86/cache.h>'

Change-Id: I2bf1eb87bb5476dd77b5a56dfe8846e82d414523
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40666
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/cpu/qemu-x86/cache_as_ram_bootblock.S

@@ -1,7 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 /* This file is part of the coreboot project. */
 
-#include <cpu/x86/cache.h>
 #include <cpu/x86/post_code.h>
 
 .global bootblock_pre_c_entry