Merge "Add Instant hotspot preference" into udc-qpr-dev am: 67d5cb42e9

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/24483137

Change-Id: I345ec2843e47be6ba23b64807eb1b23ad479738a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>