cpu/x86/mp_init: use types.h include

Using types.h as include instead of stddef.h and stdint.h will also
provide commonlib/bsd/cb_err.h which will be used in follow-up patches.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I08a68dc827d60c6c9a27b3ec8b74b9c8a2c96d12
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58452
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/cpu/x86/mp_init.c

@@ -1,8 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <console/console.h>
-#include <stddef.h>
-#include <stdint.h>
 #include <string.h>
 #include <rmodule.h>
 #include <arch/cpu.h>
@@ -25,6 +23,7 @@
 #include <symbols.h>
 #include <timer.h>
 #include <thread.h>
+#include <types.h>
 
 #include <security/intel/stm/SmmStm.h>