Settings: Move 'Advanced reboot' to other position

This commit moves the 'Advanced reboot' checkbox one item down
because it looks a bit strange as first element in the list IMHO.

Before: http://goo.gl/jhw8h
After:  http://goo.gl/X3H68

Change-Id: I26d4a5caba3e720b952ec405e200c1528f7a7321
Move Superuser header below Developer Options

Change-Id: Ica85aae0d3f06e6c5e837946cfc893d9e2f4fb7d