Enables the Sharp Zaurus Collie and Poodle devices to be turned off
by pressing the "Cancel" button for a few seconds (as designed by
Sharp).

Additional small cleanups:
- removal of unused #defines and variables
- add missing __devinit/__devexit/__devinitconst annotations
- reorganized copyright notice
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>