Merge "Initialize TetheringManager lazily" am: 7c5902df7e am: b0504221b4 am: d061ad4a60

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1736505

Change-Id: Ibb7e0b93c0c360a03b55616fb3b1af06cb94b029