Merge "Do not post notification when system boot is not ready." into main am: 7f16bfb5

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/3464559



Change-Id: Ib250925d44e1d545967ac21a7ad51041c802b38c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>