Defer onIsStashedChanged() until all controllers are initialized am: aed0c4d73e am: 54291ec724 am: 36b2bc5661

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

Change-Id: Icc0d66c034aa7f39cebfa23c479bea94100aff43
Ignore-AOSP-First: this is an automerge
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>