Add ability to build vboot firmware for TPM2 support
Add ability to build vboot firmware for TPM2 support

TPM2 will have to use a different tlcl layer, the configuration option
will be provided by depthcharge at build time.

BRANCH=none
BUG=chrome-os-partner:50645
TEST=with the rest of the patches applied kevin/gru boards boot into
     chrome OS with rollback counters read from/written to TPM2

Change-Id: I0694741f5317da2c3268ee9edfdf29caff2fc26c
Signed-off-by: Vadim Bendebury <5515d6d2d0829cbe0dd0dcf2094aaded06d58514@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/356750
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>

coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot