Remove polling of TetheringManager in ConnectivityManager.

Test: manual

Bug: 144742179
Merged-In: I7d88b38eb3d741534e980b7d1e226a411b71fae2
(cherry picked from commit f8a55a19faa938b4e58310f9a90926276b7936ea)

Change-Id: I5cc4231bfb9a0709d677acbb317ee98af31bd041
1 file changed