[S] Change in coreboot[main]: soc/intel/common/gpio: support 16-bit CPU Port ID and vw mapping fix

[Cliff Huang (Code Review)]

Attention is currently required from: Bora Guvendik, Jamie Ryu, Jérémy Compostella, Saurabh Mishra, Subrata Banik, Wonkyu Kim.

Cliff Huang has posted comments on this change by Cliff Huang. ( https://review.coreboot.org/c/coreboot/+/83981?usp=email )

Change subject: soc/intel/common/gpio: support 16-bit CPU Port ID and vw mapping fix
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Patch Set 2: Code-Review-1

(1 comment)

Patchset:

PS1: 
The existing vw_index and bit position calculation is valid only if:

- first pad group starts with bit position 0. ex. vw_index = 10  position = 0.
- vw_index and postion must be continuous in between groups within a community. For instance, if the last pad of of first group has vw_index 12 and position 5, the next following group should start with vw_index 12 an position 6.

These does not hold true according to our SOC vw_index and position assignment. In order to fix this, we could have vw_base as array for each of group in the community and wv_bit_start_pos array for the starting position of each group in the community.