Cleanup: use shared apex_key am: a0b0a624ff am: ac02f99676

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2780407

Change-Id: I73ca91ef27ee8414307316525c5461173dbe9309
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>