[L] Change in libgfxinit[main]: gma tgl: Fill out power and clocks module

[Nico Huber (Code Review)]

Attention is currently required from: Angel Pons, Jérémy Compostella, Nick Vaccaro, Nico Huber, Tarun Tuli, Tim Wawrzynczak.

Nico Huber has uploaded a new patch set (#30) to the change originally created by Tim Wawrzynczak. ( https://review.coreboot.org/c/libgfxinit/+/67495?usp=email )

Change subject: gma tgl: Fill out power and clocks module
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gma tgl: Fill out power and clocks module

This is the modeset sequence for the display engine itself.  TGL has
similarities to both SKL and BXT, but also adds new programming, like
MBUS credits, Bandwidth Buddy, and of course new chicken bits.

Tested on google/delbin; can still boot successfully to the kernel and
the kernel can still properly perform its own modeset and not crash :)

Signed-off-by: Tim Wawrzynczak 
Signed-off-by: Jeremy Compostella 
Change-Id: I8f09696588aa73cebc7a44583ae5e029c705a535
---
M common/tigerlake/hw-gfx-gma-power_and_clocks.adb
M common/tigerlake/hw-gfx-gma-power_and_clocks.ads
2 files changed, 818 insertions(+), 21 deletions(-)

git pull ssh://review.coreboot.org:29418/libgfxinit refs/changes/95/67495/30