Restructure Module code [ com.android.tethering ]

Code Migration from frameworks/base/packages/Tethering ->
packages/modules/Connectivity/Tethering

BUG: 167962976
Test: TH
Merged-In: Ide2ba760c0552e614635b3e402890b587ddc3c4c
Change-Id: I68cc959b56d5984b038cea4c621c60f34472f34c
207 files changed