Merge "Merge "Don't try to handle callbacks until mSystemReady is set." into...

Merge "Merge "Don't try to handle callbacks until mSystemReady is set." into rvc-dev am: 20f7d158 am: ac376452 am: c8b59d54" into rvc-qpr-dev-plus-aosp am: 1d8df748

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12180378

Change-Id: I6add119e605ba894f21f5a99d8dd78b8ae6a9285