Set CAPABILITY_WIFI on TelephonyConnection.

+ Add listener for when wifi capability has changed on the original
Telephony Connection, and update the Telecom Connection.
~ Refactor some of the helpers and logic for how capabilities are
applied and removed, to remove redundant code.

Bug: 19151548
Change-Id: I04b8e47201bf2ec48aebaecb6a245024902333b0
1 file changed