Change in coreboot[master]: drivers/tpm/spi: Convert static functions to enum cb_err return types

[Felix Held (Code Review)]

Attention is currently required from: Subrata Banik, Tim Wawrzynczak, Christian Walter, Julius Werner.
Felix Held has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/61976 )

Change subject: drivers/tpm/spi: Convert static functions to enum cb_err return types
......................................................................

Patch Set 7: Code-Review+2