Now that there is no need to hookup on the open/close of the joystick,
it's possible to use the simplified interface input_polled_device, instead
of creating our own kthread.

[randy.dunlap@oracle.com: fix Kconfig]
[randy.dunlap@oracle.com: fix Kconfig some more]
Signed-off-by: NEric Piel <eric.piel@tremplin-utc.net>
Signed-off-by: NPavel Machek <pavel@ucw.cz>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>