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
7 files changed