ACPI S3: Add common recovery code

There is nothing to backup with RELOCATABLE_RAMSTAGE.

Change-Id: I780a71e48d23e202fb0e9c70e34420066fa0e5b5
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/15243
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/arch/x86/Makefile.inc

@@ -331,6 +331,7 @@ ifeq ($(CONFIG_ARCH_ROMSTAGE_X86_32)$(CONFIG_ARCH_ROMSTAGE_X86_64),y)
 romstage-$(CONFIG_POSTCAR_STAGE) += postcar_loader.c
 romstage-y += cbmem.c
 romstage-y += boot.c
+romstage-$(CONFIG_HAVE_ACPI_RESUME) += acpi_s3.c
 
 romstage-y += cbfs_and_run.c
 romstage-$(CONFIG_ARCH_RAMSTAGE_X86_32) += cpu_common.c