Merge "Cleanup: use shared apex_key" into main am: 6693205f17

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2780311

Change-Id: I33d15b640b97648c126cbc9e6a9f734b7187bc34
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>