Allow Custom Default Ringer Vibrations

This change allows devices to define and use custom VibrationEffects as
the default vibration used in Ringer. Before this change, devices were
only able to choose between simple and pulse-based vibration, and their
choice was read in Ringer which creates its own effect. With this
change, devices can have full control of the default vibration via a
config resource overlay.

This will allow different devices/form-factors to specify their own
default Ringer vibrations, without having to modify the Ringer code.

Bug: 282113261
Test: atest RingerTest
Change-Id: I63bfa506b357ee5586ca55d7103bb66b7f57ae87