Detect secure layers and start lazy HDCP activation

Layer snapshots are traversed to check for secure layers,
then trigger HWC to start HDCP activation when a secure
layer is detected.

Flag: com.android.graphics.surfaceflinger.flags.hdcp_negotiation
Bug: 372902990
Bug: 375340594
Test: manual
Change-Id: Ie52159043f94d7cdb079d7c48c47764017a979f5