[S] Change in coreboot[master]: drivers/spi/tpm: verify device supports TPM2

[Julius Werner (Code Review)]

Attention is currently required from: Michał Żygowski, Christian Walter, Krystian Hebel, Sergii Dmytruk.

Julius Werner has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/69022 )

Change subject: drivers/spi/tpm: verify device supports TPM2
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Patch Set 1:

(1 comment)

File src/drivers/spi/tpm/tpm.c:

https://review.coreboot.org/c/coreboot/+/69022/comment/86b3077d_57f37ceb 
PS1, Line 458: 	if (tpm2_read_reg(TPM_INTF_ID_REG, &intf_id, sizeof(intf_id)) != CB_SUCCESS) {
Can we wrap this in an `if (!CONFIG(TPM_GOOGLE))`? Just because our TPMs haven't always been 100% accurate in reflecting the spec (particularly on older versions) and I want to ensure this won't cause any issues. (Google TPMs are always TPM 2.0 anyway.)