drivers/tpm/spi: Make sure vendor id is set before processing tpm cmd

Just like coreboot, ensure that the vendor id is initialized before
processing a tpm command.

BUG=b:36873582
BRANCH=None
TEST=Compiles successfully

Change-Id: Ie44edada76287b2daa8cb7cb7aa90df104ded604
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/474107
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
1 file changed