drivers/spi/tpm: Allow TPM_SPI to be used with PC80_SYSTEM.

In order to be able to use SPI TPM on x86, allow TPM_SPI to be used
with PC80_SYSTEM.

BUG=b:35583330

Change-Id: Ibe626a192d45cf2624368db42d369202a4003123
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/19093
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
1 file changed