Change in coreboot[master]: soc/intel/common: add generic gpio lock mechanism

[Nick Vaccaro (Code Review)]

Attention is currently required from: Bora Guvendik, Furquan Shaikh, Selma Bensaid, Maulik V Vaghela, Tim Wawrzynczak, Subrata Banik, Patrick Rudolph, Karthik Ramasubramanian.
Nick Vaccaro has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/58351 )

Change subject: soc/intel/common: add generic gpio lock mechanism
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Patch Set 5:

(1 comment)

File src/soc/intel/common/block/smm/smihandler.c:

https://review.coreboot.org/c/coreboot/+/58351/comment/81025e57_bae09dff 
PS1, Line 348: gpio_lock_pad
> may be guard with if (CONFIG(DEBUG_GPIO)) ? to avoid boot time impact ?

Good suggestion, Subrata.  I'll add it back in guarded.