Clean up used EntityHeaderController

From DataUsageSummaryPreferenceController and
BatteryHeaderPreferenceController.

There are no entity header UI for these 2 controllers, so no need to
create EntityHeaderController instance.

Bug: 295260929
Test: manual - on mobile settings page
Test: manual - on data usage page
Test: manual - on battery settings page
Change-Id: Ib96c9ae93de31f86434e5203ef4acac3af50e0ef