sb/intel/ibexpeak/early_cir: add missing arch/cpu.h include

Including arch/cpu.h is needed to have the declaration for cpuid_eax,
get_fms and struct cpuinfo_x86.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I18b60f8cf33f71c7215a97ea209b8f8cf66cf42f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57729
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

src/southbridge/intel/ibexpeak/early_cir.c

@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <arch/cpu.h>
 #include <console/console.h>
 #include <device/pci_ops.h>
 #include <device/pci_def.h>