[ARM] 5458/1: pcmcia: pxa2xx-sharpsl: check if we do have Scoop config

Check if we really have Scoop config, otherwice we can get a nice Oops
during probe.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>