Add reboot hook for bootmenu.

Use it to force a SIM PIN request after reboot.
Update stable recovery to do that as well.
Start panic_daemon which handles modem panics.

Unlike the stock ROM, we don't simply exec /sbin/reboot, but present UI
to the user where he can cancel the reboot (if he's currently doing
something) and is presented with a notice after the reboot.

Also avoid starting up PVR-, phone- and GPS-related daemons in charge
only mode. Otherwise, panic_daemon will continously reboot the device in
charge only mode.

Change-Id: I1854e9c0b5ff52c85bf079bea588b65e153c19b8