settings: add summary to hide carrier label

on notification drawer.

Change-Id: Id2aff4accd5135e07585187915f7ac81b5276663
Suspend Actions & Wakelock Blocker (2/2)

Change-Id: I325cc96ba5fbfdcb6217a4007daa1a905ac1a219

Conflicts:

	AndroidManifest.xml
	res/values/cm_strings.xml
	res/xml/settings_headers.xml