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

[V Sowmya (Code Review)]

Attention is currently required from: Martin Roth, Tim Wawrzynczak, 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 (#5).

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, 734 insertions(+), 9 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/32/49732/5