[S] Change in coreboot[main]: soc/intel/common/gpio: add function to lock GPIO configuration

[Cliff Huang (Code Review)]

Attention is currently required from: Bora Guvendik, Jérémy Compostella, Pranava Y N, Subrata Banik.

Cliff Huang has posted comments on this change by Cliff Huang. ( https://review.coreboot.org/c/coreboot/+/84901?usp=email )

Change subject: soc/intel/common/gpio: add function to lock GPIO configuration
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Patch Set 3:

(1 comment)

File src/soc/intel/common/block/gpio/gpio.c:

https://review.coreboot.org/c/coreboot/+/84901/comment/c77da5f6_ceed937e?usp... :
PS3, Line 485: /* Clear lock for the exception PADs */
> > Yes. that is the intention. This function only updates the base table lock_action field. […]

Locked pads still function as it is configured, just that we won't be able to change the configuration afterwards (i.e. dp & OS). There is also TX state lock bit(s) in separate registers, but we don't consider locking those output for a selected GPOs.