[Wi-Fi] Refactor AddAppNetworksFragment to use WifiEntry but not AccessPoint.

Because WifiTracker2 refactoring in framework side is done, Settings App need to refactor AddAppNetworksFragment to use WifiEntry but not AccessPoint.

Bug: 152454787
Test: make RunSettingsRoboTests ROBOTEST_FILTER=AddAppNetworksFragmentTest
Change-Id: Ica2fb7e7fcac112140e5d64f3e4193222c974352
2 files changed