Add an OEM configurable limit for zen rules

Test: ZenModeHelperTest
Bug: 220735360
Change-Id: I3da105951af90007bf48dc6cf00aed3e28778b36
Merged-In: I3da105951af90007bf48dc6cf00aed3e28778b36
(cherry picked from commit c69747578155fc2b2b5a6d690b1e8263f281eb67)
Merged-In: I3da105951af90007bf48dc6cf00aed3e28778b36
2 files changed