Cleanup: use shared apex_key am: a0b0a624ff am: ac02f99676 am: b2050caeb7

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

Change-Id: I2265f6bf158b70ab22ecdf9ae83e6d61751ac659
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>