arch/x86: Clean up includes

Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Change-Id: Id2db229dec2ed44333faaa8c53f3a2f9d66d52e0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68200
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>

src/arch/x86/cpu_common.c

@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <cpu/cpu.h>
+#include <types.h>
 
 #if ENV_X86_32
 /* Standard macro to see if a specific flag is changeable */