Keystore 2.0: Update Wifi settings to use mostly public keystore API.

Test: N/A
Bug: 171305607
Bug: 171305388
Merged-In: Ib794c5f2d904c2b187d7d5fd00b81afc852d0052
Change-Id: Ib794c5f2d904c2b187d7d5fd00b81afc852d0052
5 files changed