Move APIs to new class: VibrationUtils

As API review, in order to have a helpful naming for an
API class, moving ringtone vibration util methods from
media/Utils.java to media/VibrationUtils.java

Bug: 432757937
Flag: android.media.audio.ringtone_vibration_utils_api
Test: atest android.media.audio.cts.UtilsTest

Change-Id: I8fbb6c0bfa6b520fdcef785dfba085a217d6e9c4