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>

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