Remove main thread ipc call in QuickQSPanel

This is done by caching the value in QuickQSPanel when it is obtained
from onTuningChanged. static methods converted to bound methods.

Test: manual
Test: change value of setting and observe effects in QSAnimator and
QSFooterImpl
Fixes: 140052679

Change-Id: I7ee605a1f71ef930ac42efbaa95998e31d53dac6