nb/intel/haswell: Move MRC glue code into a subfolder

Put the Haswell MRC glue code inside a `haswell_mrc` subfolder. Future
commits will move the Broadwell MRC/refcode glue code to be in Haswell
northbridge scope, so plan in advance.

Tested on Asrock B85M Pro4, still boots.

Change-Id: Id3e26ec1c2d5ccce928083d7ce41445908df8cf3
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55523
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/northbridge/intel/haswell/Makefile.inc

@@ -13,17 +13,12 @@ ramstage-y += acpi.c
 ramstage-y += minihd.c
 
 romstage-y += memmap.c
-romstage-y += raminit.c
 romstage-y += romstage.c
 romstage-y += early_init.c
 romstage-y += report_platform.c
 
-# We don't ship that, but booting without it is bound to fail
-cbfs-files-$(CONFIG_HAVE_MRC) += mrc.bin
-mrc.bin-file := $(call strip_quotes,$(CONFIG_MRC_FILE))
-mrc.bin-position := 0xfffa0000
-mrc.bin-type := mrc
-
 postcar-y += memmap.c
 
+subdirs-y += haswell_mrc
+
 endif

src/northbridge/intel/haswell/haswell_mrc/Makefile.inc

@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+romstage-y += raminit.c
+
+# We don't ship that, but booting without it is bound to fail
+cbfs-files-$(CONFIG_HAVE_MRC) += mrc.bin
+mrc.bin-file := $(call strip_quotes,$(CONFIG_MRC_FILE))
+mrc.bin-position := 0xfffa0000
+mrc.bin-type := mrc

src/northbridge/intel/haswell/haswell_mrc/raminit.c

@@ -14,6 +14,8 @@
 #include <device/pci_ops.h>
 #include <device/dram/ddr3.h>
 #include <northbridge/intel/haswell/chip.h>
+#include <northbridge/intel/haswell/haswell.h>
+#include <northbridge/intel/haswell/raminit.h>
 #include <smbios.h>
 #include <spd.h>
 #include <security/vboot/vboot_common.h>
@@ -23,9 +25,7 @@
 #include <timestamp.h>
 #include <types.h>
 
-#include "raminit.h"
 #include "pei_data.h"
-#include "haswell.h"
 
 #define MRC_CACHE_VERSION 1