Merge "KeyMint VTS: cope with ATTEST_KEY +/- SIGN" into tm-dev am: df427391cd

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/18868609

Change-Id: I0d14de6dc08ff96bc36f1af442d051aae57cdd00
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>