Merge "ueventd: Wait for runtime apex before running external firmware...

Merge "ueventd: Wait for runtime apex before running external firmware handler" am: 852e22d7 am: f326444c am: 3bf1e551

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1926942



Change-Id: I297011091c3ba9371c50f132bcc83c5c6cab2928
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>