siemens/mc_tcu3: Clear checksums in hwinfo

Clear the precomputed checksums in hwinfo as they
will be updated in manufacturing process.

Change-Id: I952ca8f1ca32831c4b296de633c0d58da111ccba
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: http://review.coreboot.org/12475
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
1 file changed