Merge "Move "Allow 2G" controller under DisabledSubscriptionController." into sc-dev am: cf77b7a248 am: 87259ab2af

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/15491273

Change-Id: I3a5aa2741d2a8bb9495fb5e88b27d1248d60f7ef