Separating quota window for pre-S apps

Decoupling the window gives us more flexibility to change the quotas for
pre-S apps. It also allows us to restore the pre-S behavior so we do not
break any apps unexpectedly.

Test: atest CtsAlarmManagerTestCases
atest FrameworksMockingServicesTests:com.android.server.alarm

Bug: 171306433
Change-Id: I8ee190c23a078db50aa7c98ce6f56f8ae601c01b