Defer onIsStashedChanged() until all controllers are initialized am: aed0c4d73e am: cc10db044f

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/17921731

Change-Id: I0471cb6feb14e517dea2ca0a07445335ecee45a5
Ignore-AOSP-First: this is an automerge
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>