nb/intel/sandybridge: Clean up post Haswell SPD mapping API migration

With migration to Haswell SPD mapping interface complete:

1.  Remove weak stubs meant to ensure smooth transition and
    internalizes mainboard_get_spd() within raminit.c.
2.  Remove post-mainboard SPD data sanitization code in raminit_mrc.c,
    now that it fills its own SPD data.
3.  Remove old prototypes from raminit_native.h
4a. Drops raminit_native.h from raminit.c, as individual headers
    therein are already included.
4b. Drop another header from raminit.c IWYU identified as unneeded.
    asus/p8z77-m still builds afterwards.
    (sandybridge to receive a full IWYU cleanup later.)

Change-Id: Ie073c1386cd0a645069f0e1416263b4fa359b74b
Signed-off-by: Keith Hui <buurin@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76991
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/northbridge/intel/sandybridge/raminit.c b/src/northbridge/intel/sandybridge/raminit.c
index 2575a9c..085292b 100644
--- a/src/northbridge/intel/sandybridge/raminit.c
+++ b/src/northbridge/intel/sandybridge/raminit.c
@@ -1,7 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <console/console.h>
-#include <commonlib/region.h>
 #include <cf9_reset.h>
 #include <string.h>
 #include <cbfs.h>
@@ -20,7 +19,6 @@
 #include <types.h>
 
 #include "raminit.h"
-#include "raminit_native.h"
 #include "raminit_common.h"
 #include "sandybridge.h"
 #include "chip.h"
@@ -140,7 +138,7 @@
 	return match;
 }
 
-void read_spd(spd_raw_data * spd, u8 addr, bool id_only)
+static void read_spd(spd_raw_data *spd, u8 addr, bool id_only)
 {
 	int j;
 	if (id_only) {
@@ -152,10 +150,7 @@
 	}
 }
 
-/* Temporary stub */
-__weak void mb_get_spd_map(struct spd_info *spdi) {}
-
-__weak void mainboard_get_spd(spd_raw_data *spd, bool id_only)
+static void mainboard_get_spd(spd_raw_data *spd, bool id_only)
 {
 	const struct northbridge_intel_sandybridge_config *cfg = config_of_soc();
 	unsigned int i;