Merge "[Tetheirng] Show a dialog indicate tethering is unsupported by carrier." am: d915b09e21 am: 0e8aed527f

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Settings/+/1984590

Change-Id: I874e3e478ce29dda24860a2e007279bf7ca77c47