Allow BrightLineFalsingManager settings to be experimented with via Phenotype.

This is a CP of http://ag/8687829

Bug: 138308096
Test: atest SystemUITests
Change-Id: I9e2b22b157c45da1606466acdfff3c5de7f182e1
Merged-In: I9fa4d1344bb184dea00f92f8d265667f0be11466
(cherry picked from commit e38da07841f8d226e2c024709adfd4b866036fb1)
5 files changed