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: e98160cd am: 6c929d55" into rvc-qpr-dev-plus-aosp am: d9bf91ab

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

Change-Id: I33605093ebb491e8fd84f1174f89225e3dd5f940