And migrate BillingCycleRepository to use it.
Fix: 339197552
Test: manual - on data usage
Test: unit test
Change-Id: Ieac295f37fdbf75d184d66ea11f170652af3ec5f
Unify the enable logic for the "Data warning & limit" page.
Bug: 290856342
Test: manual - on DataUsageList
Test: m RunSettingsRoboTests
Change-Id: I3014461ef21768b5d0eb6d91873a4ba52d20f6bf
Migrate BillingCyclePreference to BillingCycleRepository first, will
also migrate DataUsageList in future cl.
Also fix an issue that the BillingCyclePreference initial enable state
not set.
Bug: 290856342
Test: manual - on mobile settings
Test: unit test
Change-Id: Idd171fefbc30763010afb7bfb68543612f7b9b1a