Added OSU provisioning support

Added support for clicking on an OSU provider AP to start the
provisioning service. Provisioning callbacks currently do nothing.
The connected AP while provisioning still appears to be a normal
AP and displays the SSID rather than the provider name.

Tracking bug for adding robolectric tests: b/122849296

Bug: 118705403
Test: manual, build and tap on the OSU provider AP
Change-Id: I71d4fd70597c00ec82086e090695b35a49d9a23f