[Settings] Refactor for performance

Refactor DataDuringCallsPreferenceController in order to reduce the time
spend on constuct and initialize DataDuringCallsPreferenceController.

Bug: 141833767
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=DataDuringCallsPreferenceControllerTest
Change-Id: I484cafa739f9e6e58427894712f2bb7e2ed1f4ff
1 file changed