Merge "Move tethering related hidden API flag file entries to packages/modules/Connectivity/Tethering" into sc-dev am: 8c37e554 am: 47516b61 am: 45ca78fa

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15132974

Change-Id: I92f050bbbd16325206a5952916b1f5ac22bc1918