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

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

Change-Id: I95f2227af3076d7e78bb527f4df956d15753948f