maple: allow removal and reinsertion of keyboard driver module

Allow the removal (and subsequent reinsertion) of the maple_keyb (maple
keyboard) driver by adding a working removal function.

Also tidy long lines.

Signed-off-by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
Cc: Dmitry Torokhov <dtor@mail.ru>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>