[S] Change in coreboot[main]: drivers/intel/gma: Update port select bit definitions

[Subrata Banik (Code Review)]

Attention is currently required from: Arthur Heymans, Julius Werner, Kapil Porwal, Karthik Ramasubramanian, Lean Sheng Tan, Nick Vaccaro, Nick Vaccaro, Werner Zeh.

Hello Arthur Heymans, Julius Werner, Kapil Porwal, Lean Sheng Tan, Nick Vaccaro, Nick Vaccaro, Werner Zeh, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/78078?usp=email

to look at the new patch set (#2).

The following approvals got outdated and were removed: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

Change subject: drivers/intel/gma: Update port select bit definitions
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drivers/intel/gma: Update port select bit definitions

This commit updates the port select bit definitions for the
TRANS_DDI_FUNC_CTL registers in the Intel GMA driver to accommodate
the changes introduced since TGL SoC.

Specifically, the following changes were made:

- Updated the DDI select bit definitions from 3-bits (bit 28-30) to
  4-bits (bit 27-30).
- Introduces `INTEL_GMA_VERSION_2` config to accommodate the port and
  pipe related differences between previous generation GMA register
  (TRANS_DDI_FUNC_CTL) to the current generation GMA register.

This commit backports the change from the following upstream patch:
https://patchwork.freedesktop.org/patch/msgid/20190713010940.17711-3-
[e-mail]

BUG=b:299137940
TEST=Able to build and boot google/rex.

Change-Id: I815ffa90c2e235afd70baa7e3837e1f9af89b1b0
Signed-off-by: Subrata Banik 
---
M src/drivers/intel/gma/Kconfig
M src/drivers/intel/gma/i915.h
M src/drivers/intel/gma/i915_reg.h
3 files changed, 36 insertions(+), 3 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/78/78078/2