Change in coreboot[master]: mb/intel/shadowmountain: Add the ramstage code

[V Sowmya (Code Review)]

Attention is currently required from: Martin Roth, Tim Wawrzynczak, Subrata Banik, Balaji Manigandan, Aamir Bohra.
Hello build bot (Jenkins), Patrick Georgi, Martin Roth, Tim Wawrzynczak, Subrata Banik, Balaji Manigandan, Aamir Bohra,

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

https://review.coreboot.org/c/coreboot/+/49732

to look at the new patch set (#2).

Change subject: mb/intel/shadowmountain: Add the ramstage code
......................................................................

mb/intel/shadowmountain: Add the ramstage code

This patch includes the ramstage changes for the
shadowmountain board.

BUG=b:175808146
TEST= Build and boot shadowmountain board.

Signed-off-by: V Sowmya 
Change-Id: I419eecefddf9ee6e4249ada041ebeb1b78e85eb7
---
M src/mainboard/intel/shadowmountain/Kconfig
M src/mainboard/intel/shadowmountain/Makefile.inc
A src/mainboard/intel/shadowmountain/ec.c
A src/mainboard/intel/shadowmountain/mainboard.c
A src/mainboard/intel/shadowmountain/smihandler.c
M src/mainboard/intel/shadowmountain/variants/baseboard/Makefile.inc
M src/mainboard/intel/shadowmountain/variants/baseboard/devicetree.cb
M src/mainboard/intel/shadowmountain/variants/baseboard/early_gpio.c
A src/mainboard/intel/shadowmountain/variants/baseboard/gpio.c
A src/mainboard/intel/shadowmountain/variants/baseboard/include/baseboard/ec.h
M src/mainboard/intel/shadowmountain/variants/baseboard/include/baseboard/variants.h
11 files changed, 761 insertions(+), 22 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/32/49732/2