AudioService: properties for configuring ring/notif steps/default vol

  Define 4 new properties that can be used to override the default
notification and ringtone volume number of steps and default value.
  Throw IllegalArgumentException when max volume is not strictly
positive, if default volume is greater than max volume or
lower than min volume.

Bug: 228180814
Test: dumpsys audio to check default/max for notif/ring
Change-Id: Ib12fd2207b1201ced4bc838892ed23d10e45c3c9