Align the eltan mboot support with coreboot tpm support to limit the amount of custom code. We now only support SHA256 pcrs, only single a single digest will be handled in a call. The pcr invalidation has been changed fixed values are now loaded while the correct algortihm is selected. BUG=N/A TEST=tested on fbg1701 Change-Id: Id11389ca90c1e6121293353402a2dd464a2e6727 Signed-off-by: Wim Vervoorn <wvervoorn@eltan.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/36483 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Frans Hendriks <fhendriks@eltan.com>