2api: add call to reset Cr50

When booting into Alt OS legacy mode, we plan to disable TPM
before handing off control to the OS.

We need to reset Cr50 to get TPM back to its normal state.
Add an API call to accomplish this.

BUG=b:120586131
TEST=compile, flash, and boot eve

Change-Id: I7eec4d97f4c59c63ab5cd0910e6a37f7e2877fc6
Reviewed-on: https://chromium-review.googlesource.com/c/1354146
Commit-Queue: Joel Kitching <kitching@chromium.org>
Tested-by: Joel Kitching <kitching@chromium.org>
Reviewed-by: Joel Kitching <kitching@chromium.org>
3 files changed