Add feature flag for dynamic Early Wakeup configuration, where SF
can enable or disable the Early Wakeup notification for a display,
based on its Power mode.
CRs-Fixed: 2796511
Change-Id: If517483676b95e3484d65c2478ac32a03903e0a4
Add Display Extension api to enable or disable Early Wake-up on a
given display.
CRs-Fixed: 2765806
Change-Id: Iee3a73bb2ff18044772519cecc406aa59f2aa542