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 branch 'cm-10.2' of https://github.com/CyanogenMod/android_frameworks_base into cm-10.2