hwc: Use the new HdcpLevelsChanged HAL API function Currently we pass the HDCP level change notifications via the legacy onVsync hack. But now we have a new HAL interface for that purpose. This CL implements most of the changes necessary to use the new HAL interface. Bug: 293945485 Test: build HWC Change-Id: Ied2a4f9b47b54e6998db42b11a82b0b49d0e1944