settings: Make mobile settings a first-class citizen

 * Nobody likes carriers, but let's not bury these settings behind
   10 layers of indirection. Many users (like me) who travel often
   will need to access these options frequently.
 * The top level switch disables mobile data.

Change-Id: I1bd4d1116a2c73832230d66c94df2c3c0aacf698
Merge remote-tracking branch 'cm/cm-11.0' into HEAD

Conflicts:
	src/com/android/settings/Settings.java

Change-Id: Id6d4967b31d3621374ba7153cd0fe317d6486d71