The callback would be fired when offload started, stopped, or failed.
If offload is not supported, "failed" callback would be fired when user
enable tethering. Enabling multiple tethering would not have multiple
offload status callbacks because offload should already be started or
failed.
Bug: 130596697
Test: -build, flash, boot
-atest TetheringTests
-ON/OFF hotspot
Change-Id: Ia0398601144b0e5f61dc0c5771eacf13e7cfbb59
05bee8027d