Merge "Merge "Move tethering related hidden API flag file entries to packages/modules/Connectivity/Tethering" into sc-dev am: 8c37e554 am: 124f232c" into sc-v2-dev-plus-aosp am: 7187b7c5

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

Change-Id: Idb6af3dc812515493e0408df2354d2aee0fccd57