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/northbridge/intel/x4x/raminit.c

@@ -17,7 +17,6 @@
 #include <cbmem.h>
 #include <cf9_reset.h>
 #include <console/console.h>
-#include <cpu/x86/cache.h>
 #include <cpu/x86/mtrr.h>
 #include <arch/cpu.h>
 #if CONFIG(SOUTHBRIDGE_INTEL_I82801GX)