Camera: Bump the thread priority during stream configuration and open

Bump the scheduling priority of two critical performance paths
that include stream configuration and camera device open.

Flag: com.android.internal.camera.flags.realtime_priority_bump
Bug: 336628522
Test: Camera CTS,
Manual using camera application

Change-Id: I8ac10099e74bfae91bcc3b5caadc2276510c97e3
Merged-In: I8ac10099e74bfae91bcc3b5caadc2276510c97e3