SF: plumb PhysicalDisplayId to kernelIdleTimerCallback and vrrDisplayIdle

Scheduler::kernelIdleTimerCallback() and
ISchedulerCallback::vrrDisplayIdle() both hardcode in active/pacesetter
displays in the body. This CL adds PhysicalDisplayId as an argument to
these functions and passes the display in that way instead to make it
more general.

Flag: EXEMPT trivial refactor
Bug: 255635821
Test: presubmit
Change-Id: I739e4e5bd2621e1459f6d3d9c152f06ed24f1602