Show advanced reboot if using an insecure lock screen

Enables the advanced reboot menu when locked if the selected lock method
is insecure (= slide unlock).

Change-Id: I759b7b31c5411597e2537a85183d73ec02eb2461
Merge "Show advanced reboot if using an insecure lock screen" into cm-10.1
Merge branch 'cm-10.1' into martincz