Move AmbientFilter from whitebalance to utils

AmbientFilter is now used not only by whitebalance but also by DisplayModeDirector.

Bug: 137368719
Exempt-From-Owner-Approval: Santos is designated by Michael
Test: atest AmbientLuxTest AmbientSensorTest
Change-Id: Ib377be5cc7ccbae25607d37a7de93d6564c0d184
8 files changed