Simplify default keyboard vibration settings value

CL[1] remove the default keyboard vibration state
device config, use the fixed value in the controller.

[1]: I9060fbc83087599fa0d9a56be3de27a2dcf15a94

Flag: EXEMPT refactor
Bug: 332660772
Test: atest KeyboardVibrationTogglePreferenceControllerTest
Change-Id: I7e5a195047e96582bd80898134051924c0ad72ab