Merge "Implement GetRootOfTrust" am: 7e25d3e8fa

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2115452

Change-Id: Ie005e4728e08610dd4ae1449b589219a8af25b7e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>