Change in coreboot[master]: soc/mediatek/mt8186: Add GPIO driving functions

[Rex-BC Chen (Code Review)]

Attention is currently required from: Hung-Te Lin, Paul Menzel, Angel Pons.
Rex-BC Chen has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/62471 )

Change subject: soc/mediatek/mt8186: Add GPIO driving functions
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Patch Set 9:

(2 comments)

File src/soc/mediatek/common/include/soc/gpio_common.h:

https://review.coreboot.org/c/coreboot/+/62471/comment/93e1cb3e_1796517d 
PS4, Line 31: };
> This enum provides no benefit. I'd rather define the specific enum values in soc/gpio. […]

Done

File src/soc/mediatek/mt8186/gpio.c:

https://review.coreboot.org/c/coreboot/+/62471/comment/d396e0b4_88070045 
PS8, Line 203: { -1, -1, -1, }
> I imagine this indicates the bitfield isn't implemented for this GPIO. […]

Done