Port "Option to control cursor in text fields using volume keys (1/2)" - AOKP

This feature is moved to framework so it also works with third party keyboards.

Change-Id: Iab8b2956489eab76229909322aa3c2233f73c32d

Conflicts:
	core/java/android/provider/Settings.java

Conflicts:
	core/java/android/provider/Settings.java