Disable SCHED_FIFO when turning off the display.

There can be long SF runtimes when turning the display on or off. Only
use SCHED_FIFO when we are actively going to be rendering frames, not
when turning the display on or off.

bug 30375418

Change-Id: Ibef8e5f3bba0bafc36f92f9f1b299f015fc335f9
2 files changed