Change in coreboot[master]: soc/intel/xeon_sp: Add RTC failure checking

[Jingle Hsu (Code Review)]

Hello Philipp Deppenwiese, Patrick Georgi, Martin Roth, Jonathan Zhang, Johnny Lin, Christian Walter, Angel Pons, Rocky Phagura, Morgan Jang, Patrick Rudolph,

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

https://review.coreboot.org/c/coreboot/+/43004

to look at the new patch set (#4).

Change subject: soc/intel/xeon_sp: Add RTC failure checking
......................................................................

soc/intel/xeon_sp: Add RTC failure checking

Add a weak function mainboard_rtc_failed() for mainboard customization.

Check RTC_PWR_STS bit for RTC battery removal or CMOS clear jumper
triggered event.

Signed-off-by: Jingle Hsu 
Change-Id: Ic6da84277e71a5c51dfa4d97d5d0c0184478e8f0
---
M src/soc/intel/xeon_sp/Makefile.inc
M src/soc/intel/xeon_sp/include/soc/pmc.h
M src/soc/intel/xeon_sp/include/soc/romstage.h
A src/soc/intel/xeon_sp/pmutil.c
M src/soc/intel/xeon_sp/romstage.c
5 files changed, 34 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/04/43004/4