[M] Change in coreboot[master]: mb/google/myst: Enable AP <-> GSC communication

[Karthik Ramasubramanian (Code Review)]

Attention is currently required from: Raul Rangel, Jon Murphy.

Karthik Ramasubramanian has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/74111 )

Change subject: mb/google/myst: Enable AP <-> GSC communication
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Patch Set 32:

(2 comments)

File src/mainboard/google/myst/Kconfig:

https://review.coreboot.org/c/coreboot/+/74111/comment/6d65cadb_7380576d 
PS32, Line 23: SOC_AMD_COMMON_BLOCK_I2C3_TPM_SHARED_WITH_PSP
This requires PSP support to assume ownership of the bus. Probably have to wait until the board is powered on.

File src/mainboard/google/myst/mainboard.c:

https://review.coreboot.org/c/coreboot/+/74111/comment/7d8f1fa7_4b065e52 
PS32, Line 54: static void configure_psp_tpm_gpio(void)
This needs to wait until PSP assumes ownership of the bus.