This change modifies the KeyguardClockSwitch and Controller to get clocks from the ClockRegistry. Since the only clock available from the registry is the default one, this should have no user-facing changes, and is intended only to update the relevant codepaths. Bug: 229771520 Test: Manual and Automated Change-Id: Ia053aaec6987e00de980388a6c024d8bcf5203a2