drivers/i2c/tpm: Move common variables to header

Move the common enums and variables to tpm.h so it can be
used by multiple drivers.

BUG=chrome-os-partner:53336

Change-Id: Ie749f13562be753293448fee2c2d643797bf8049
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://review.coreboot.org/16662
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
2 files changed