[coreboot-gerrit] Change in coreboot[master]: mb/google/volteer/variants/eldrid: add memory.c for ddr4 support

[Nick Chen (Code Review)]

Hello build bot (Jenkins), Furquan Shaikh, Patrick Georgi, Martin Roth, Wonkyu Kim, Caveh Jalali, Ravishankar Sarawadi, Nick Vaccaro, Derek Huang,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/44632

to look at the new patch set (#12).

Change subject: mb/google/volteer/variants/eldrid: add memory.c for ddr4 support
......................................................................

mb/google/volteer/variants/eldrid: add memory.c for ddr4 support

Add new memory.c to support DDR4 memory types.

Use the new meminit_ddr() and variant_memory_sku() for eldrid variant
code on memory.c

BUG=b:161772961
TEST='emerge-volteer coreboot chromeos-bootimage' and verify that Eldrid
can boots. NOTE that tests the ddr4 side of the implementation.

Change-Id: I2c7b30093a8d85bac5aba5b83768af5eb36c4f70
Signed-off-by: Nick Chen 
---
A src/mainboard/google/volteer/variants/eldrid/Makefile.inc
A src/mainboard/google/volteer/variants/eldrid/gpio.c
A src/mainboard/google/volteer/variants/eldrid/memory.c
M src/mainboard/google/volteer/variants/eldrid/overridetree.cb
4 files changed, 394 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/32/44632/12