Settings: Add preference for EdgeGesture service.

Change-Id: I0325b0a9aa6eb943b48483aebe151726a2c64ac4

Conflicts:
	res/values/cm_strings.xml
Revert "Settings: Add preference for EdgeGesture service."

This reverts commit ec65c6dee175fb54d18dd8bdd1bd352fabf8baa5.