Merge "Adding verification for P256 signatures." am: dccf8ab7c2 am: c9331d8d12 am: a3aa16cd6c

Original change: https://android-review.googlesource.com/c/platform/tools/security/+/2065587

Change-Id: I8cefa3687dbae4ddf2a39dd13857c320ed0fe053
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>