Change in coreboot[master]: mb/google/brya: Enable DDR4 SODIMM for brask

[Alan Huang (Code Review)]

Attention is currently required from: David Wu, Furquan Shaikh, Paul Menzel, Zhuohao Lee, Alan Huang.
Alan Huang has uploaded a new patch set (#16) to the change originally created by David Wu. ( https://review.coreboot.org/c/coreboot/+/56539 )

Change subject: mb/google/brya: Enable DDR4 SODIMM for brask
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mb/google/brya: Enable DDR4 SODIMM for brask

Enable SMBus to support DDR4 SODIMM for brask. Enable 'smbus' in
brask device tree and add SPD addressese for the two DIMMs.

Separate the Kconfig items of brya and brask. Move
HAVE_SPD_IN_CBFS and CHROMEOS_DRAM_PART_NUMBER_IN_CBI to brya
and add config SPD_CACHE_IN_FMAP to brask.

Add a new section RW_SPD_CACHE to fmd for caching SPD data.

The renamed romstage.c is used by both brya and brask and a new
function variant_get_spd_info is provided to support the different
SPD source types.

BUG=b:194055762
BRANCH=None
TEST=build pass

Change-Id: I41c57a3df127356b8c7e619c4d6144dc73aeac72
Signed-off-by: Alan Huang 
---
M src/mainboard/google/brya/Kconfig
M src/mainboard/google/brya/Makefile.inc
M src/mainboard/google/brya/chromeos.fmd
R src/mainboard/google/brya/romstage.c
M src/mainboard/google/brya/variants/baseboard/brask/Makefile.inc
M src/mainboard/google/brya/variants/baseboard/brask/devicetree.cb
A src/mainboard/google/brya/variants/baseboard/brask/memory.c
M src/mainboard/google/brya/variants/baseboard/brya/memory.c
M src/mainboard/google/brya/variants/baseboard/include/baseboard/variants.h
9 files changed, 68 insertions(+), 12 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/39/56539/16