Merge "Cleanup: use a shared apex_key" into main am: b0675a2e

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2780307



Change-Id: Id79c71c3519a5933df9e1385d36c073d0164c3a3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>