[M] Change in libgfxinit[main]: gma: Re-structure TC port types

[Nico Huber (Code Review)]

Attention is currently required from: Angel Pons.

Nico Huber has posted comments on this change by Nico Huber. ( https://review.coreboot.org/c/libgfxinit/+/83599?usp=email )

Change subject: gma: Re-structure TC port types
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Patch Set 1:

(1 comment)

File common/hw-gfx-gma-config_helpers.adb:

https://review.coreboot.org/c/libgfxinit/+/83599/comment/2c237208_e29d5715?u... :
PS1, Line 68: 
            :                         when DP_TC1 | HDMI_TC1 | USBC1   => DDI_TC3,
            :                         when DP_TC2 | HDMI_TC2 | USBC2   => DDI_TC4,
            :                         when DP_TC3 | HDMI_TC3 | USBC3   => DDI_TC5,
            :                         when DP_TC4 | HDMI_TC4 | USBC4   => DDI_TC6,
> ADL-P (XeLPD) doesn't even have TC5 .. TC6 so it definitely feels wrong. […]

Yes, the TGL PRM seems actually the only source that talks about 6 TC ports /
register sets. I guess they just wanted to be prepared. Now I'm wondering if
it's wise to keep the additional register definitions in the TGL code. I guess
we'll see during review.