Adjust idle timings.

1. Reduce the time to enter deep device idle from ~71 minutes to a few
   minutes. Based on user behavior, the system can be more confident
   than not that the user won't turn the screen on for a while after
   a few minutes of screen off time.
2. Shorten the time to enter light Doze and increase the max light idle
   time to 30 minutes and change the backoff system to get to 30 minutes
   more slowly.

Bug: 187947479
Bug: 299329948
Test: atest DeviceIdleTest
Test: atest FrameworksMockingServicesTests:DeviceIdleControllerTest
Change-Id: Id4fb80d9def10d511759f6ae853ab6ce8909ca36