[Settings] Expand scrollable area of Wifi calling UI

1. Replace InstrumentedDialogFragment by SettingsPreferenceFragment.
   Enable the capability of shirnking the size of title.
2. Move switch bar into Preference.
   Enlarge scrollable area within this UI page.

Bug: 224661026
Test: local
Change-Id: I6e0a491721e9f93858c389593b2bb891f6fa8f8d