Merge "Only update default home when the preferred home activity is modified."...

Merge "Only update default home when the preferred home activity is modified." into sc-dev am: bfdcaaf2

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14314665

Change-Id: I7e45d1d0ea6291d48013a23ebd5b8c5b3004fcc9