serial: sh-sci: don't use __devexit_p to wrap sci_remove

The function sci_remove is defined without any section modifier, so
don't use __devexit_p to wrap it.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Magnus Damm <damm@opensource.se>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Paul Mundt <lethal@linux-sh.org>