[L] Change in coreboot[main]: soc/mediatek/mt8196: Add clk_buf drivers

[Jarried Lin (Code Review)]

Attention is currently required from: Hung-Te Lin, Jarried Lin, Yidi Lin, ot_song fan.

Hello Hung-Te Lin, Yidi Lin, Yu-Ping Wu, build bot (Jenkins), ot_song fan,

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

https://review.coreboot.org/c/coreboot/+/85841?usp=email

to look at the new patch set (#3).

The following approvals got outdated and were removed: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

Change subject: soc/mediatek/mt8196: Add clk_buf drivers
......................................................................

soc/mediatek/mt8196: Add clk_buf drivers

MT8196 use MT6685 clk_buf, and will use new RC mode with srclken_rc.
The clk_buf will provide several 26M clocks, and these clocks can be
independently turned on. RC mode will determine which clocks to be
turned on based on users' requests, which is collected into PMRC_EN
register by srclken_rc.

TEST=Build pass.
BUG=b:317009620

Signed-off-by: ot_song fan 
Change-Id: Ie18bfbb2f3354ba3645799857061dc20de7f6d84
---
M src/soc/mediatek/mt8196/Makefile.mk
A src/soc/mediatek/mt8196/clkbuf_ctl.c
A src/soc/mediatek/mt8196/include/soc/clkbuf_ctl.h
3 files changed, 878 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/41/85841/3