Put all notification services in one place

Change-Id: I865a2cea5e25d59fc1a78041878bc48c3bf024be

Conflicts:
	res/values/cr_strings.xml
	res/xml/settings_headers.xml
Correct icon size of notification services settings

Change-Id: I9d1a14ec34d7b133b1963d250f693d9204e414c3