[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/28a0f40d_bf17a30c?usp... :
PS3, Line 485: /* Clear lock for the exception PADs */
> > Locked pads still function as it is configured, just that we won't be able to change the configura […]

The thing is that we don't enable lock in our MB gpio.c and fw_config.c for pretty much all GPIOs today, In particularly, those configuration are generated from HW mapping document where lock decision are not determined and provided. We either manually replaced with lock macros for each of PAD in the ramstage table or fw_config.c or we could use this new function to add lock prior to writing to the registers.