Merge "startTethering with silent entitlement in systemui" am: 20df56adb7 am: 0762ef2d94 am: 3771cea157

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1450641

Change-Id: I7d7822d8a3a8a4399524fc715ff3746d1396a2ae