[M] Change in coreboot[master]: mb/google/myst: Add eSPI configuration

[Jon Murphy (Code Review)]

Attention is currently required from: Raul Rangel, Felix Held, Mark Hasemeyer.

Jon Murphy has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/74110 )

Change subject: mb/google/myst: Add eSPI configuration
......................................................................

Patch Set 31:

(1 comment)

File src/mainboard/google/myst/variants/baseboard/gpio.c:

https://review.coreboot.org/c/coreboot/+/74110/comment/4b8cc3c3_86254eaf 
PS31, Line 205: __weak void variant_espi_gpio_table(const struct soc_amd_gpio **gpio, size_t *size)
> Will those pads would change? if not, maybe no need the weak since no override will happen.

Probably not, we can add it back alter if needed.