[M] Change in coreboot[main]: soc/mediatek/mt8196: Fix timer reset in BL31

[Jarried Lin (Code Review)]

Attention is currently required from: Hung-Te Lin, Jarried Lin, Yidi Lin, Zhanzhan Ge.

Hello Hung-Te Lin, Yidi Lin, Yu-Ping Wu, Zhanzhan Ge, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/83928?usp=email

to look at the new patch set (#21).

The following approvals got outdated and were removed:
Verified+1 by build bot (Jenkins)

Change subject: soc/mediatek/mt8196: Fix timer reset in BL31
......................................................................

soc/mediatek/mt8196: Fix timer reset in BL31

1. Set systimer compensation to version 2.0.
2. Correctly setting compensation is the foundation for the normal
operation of systimer. The system does not need to serve pending IRQ from
systimer after rebooting. Therefore we clear systimer IRQ pending bit at
early booting.

TEST=Build pass and timestamp is not reset in ATF and payload
BUG=b:343881008

Change-Id: I520986b81ca153ec3ce56558a80619448cfc0c59
Signed-off-by: Zhanzhan Ge 
---
M src/soc/mediatek/mt8196/Makefile.mk
M src/soc/mediatek/mt8196/include/soc/timer.h
M src/soc/mediatek/mt8196/timer.c
A src/soc/mediatek/mt8196/timer_prepare.c
4 files changed, 62 insertions(+), 3 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/28/83928/21