Input: joydev - remove custom conversion from jiffies to msecs

Replace the MSECS() macro with the jiffies_to_msecs() function provided
in jiffies.h

Signed-off-by: Tobias Klauser <tklauser@nuerscht.ch>
Signed-off-by: Domen Puncer <domen@coderock.org>
Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>