[L] Change in libgfxinit[master]: common: Begin Tiger Lake integration

[Tarun Tuli (Code Review)]

Attention is currently required from: Felix Singer, Sean Rhodes, Nico Huber, Angel Pons, Arthur Heymans.

Tarun Tuli has uploaded a new patch set (#11) to the change originally created by Tim Wawrzynczak. ( https://review.coreboot.org/c/libgfxinit/+/65087 )

Change subject: common: Begin Tiger Lake integration
......................................................................

common: Begin Tiger Lake integration

Tiger Lake's integrated graphics engine is built off an entirely new
igfx architecture named "Iris Xe." This patch adds just enough support
to compile for Tiger Lake. Fortunately, the backlight programming
hasn't changed since SKL, so with a little bit of hacking, one can
also have libgfxinit turn on the backlight to verify something is
working and running.

The first pass through the support will focus mostly on the eDP panel,
then Type-C ports (both in fixed/native mode [DP/HDMI] and in Type-C
DP Alt Mode). TBT will not be mostly ignored in this first pass, as
it is not as widely used (yet?) as the other protocols.

Tested on google/voxel, with DEBUG_ADA_CODE enabled.

Signed-off-by: Tim Wawrzynczak 
Change-Id: Ic8d32598e5611453ce53f1deaeab981b9f2a952f
---
M common/Makefile.inc
M common/hw-gfx-gma-config.ads.template
M common/hw-gfx-gma-config_helpers.adb
M common/hw-gfx-gma.adb
M common/hw-gfx-gma.ads
A common/tigerlake/Makefile.inc
A common/tigerlake/hw-gfx-gma-connectors.adb
A common/tigerlake/hw-gfx-gma-plls.adb
A common/tigerlake/hw-gfx-gma-plls.ads
A common/tigerlake/hw-gfx-gma-port_detect.adb
A common/tigerlake/hw-gfx-gma-power_and_clocks.adb
A common/tigerlake/hw-gfx-gma-power_and_clocks.ads
A configs/tigerlake
13 files changed, 544 insertions(+), 54 deletions(-)

git pull ssh://review.coreboot.org:29418/libgfxinit refs/changes/87/65087/11