w1-gpio: remove erroneous __exit and __exit_p()

w1-gpio: remove erroneous __exit and __exit_p()

commit 01230551e7c2fb9a1c2519b356d703851049cbe0 upstream.

Commit 8a1861d997 ("w1-gpio: Simplify & get rid of defines") changed
(apparently unknowingly) the driver to a hotpluggable platform-device
driver but did not not update the section markers for probe and remove
(to __devinit/exit, which have since been removed). A later commit fixed
the section mismatch for probe, but left remove marked with __exit.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>