Added AccessPoint cache integration for Passpoint networks

This is needed since WifiSettings does not update an AP from
WifiTracker if the AP key matches, resulting in WifiSettings
having a stale AP reference if the AP is not cached on the
WifiTracker side.

Tracking bug for adding robolectric tests: b/122849296

Bug: 118705403
Test: manual, build and check if verbose scan list updates
Change-Id: I5ffcb186047fb38df53a8c5b877d6e4f432f1417