Merge "Expose UpdateEngine.triggerPostinstall to modules." into main am: e34e8dd523

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/3336594

Change-Id: Ibff4e1df7473fd1f47f2833ce823586e8fe7a59b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>