[L] Change in coreboot[master]: soc/mediatek/mt8188: Add ddp driver to support eDP output

[Rex-BC Chen (Code Review)]

Attention is currently required from: Hung-Te Lin, Rex-BC Chen.

Hello Hung-Te Lin, build bot (Jenkins), Angel Pons, Yidi Lin, Yu-Ping Wu,

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

https://review.coreboot.org/c/coreboot/+/68487

to look at the new patch set (#6).

Change subject: soc/mediatek/mt8188: Add ddp driver to support eDP output
......................................................................

soc/mediatek/mt8188: Add ddp driver to support eDP output

Add DDP (display data path) driver that supports overlay, read/write
DMA, etc. The output goes to display interface DP_INTF0 directly.
Add ddp gclast and output_clamp settings to MT8188 to support
multi-layer display.

BUG=b:244208960
TEST=emerge-geralt coreboot.

Signed-off-by: Nathan Lu 
Change-Id: Icc0a878c609818fedd298c141bb39469fd2f6388
---
M src/soc/mediatek/mt8188/Makefile.inc
A src/soc/mediatek/mt8188/ddp.c
M src/soc/mediatek/mt8188/include/soc/addressmap.h
A src/soc/mediatek/mt8188/include/soc/ddp.h
4 files changed, 479 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/87/68487/6