Phone: Add Ring Delay feature (port forward)

This allows the user to set the number of seconds
before the ringer goes off. This is useful when
vibrate is enabled to get "vibrate before ring".

Change-Id: If9e72333cc5ce8203bc764e918ad8082312dccb7

Conflicts:

	src/com/android/phone/CallFeaturesSetting.java
	src/com/android/phone/Ringer.java