mb/amd/olivehill/bootblock.c: Add missing <arch/io.h>

Change-Id: I75ea4fc71cf22e5ad547329db2451342cee528b2
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45314
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/mainboard/amd/olivehill/bootblock.c

@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <amdblocks/acpimmio.h>
+#include <arch/io.h>
 #include <bootblock_common.h>
 #include <device/pnp_ops.h>