usb-storage: add unusual_devs entry for Casio EX-N1 digital camera

commit d7870af7e2e3a91b462075ec1ca669b482215187 upstream.

This commit sets removable subclass for Casio EX-N1 digital camera.

The patch has been tested within an ALT Linux kernel:
http://git.altlinux.org/people/led/packages/?p=kernel-image-3.0.git;a=commitdiff;h=c0fd891836e89fe0c93a4d536a59216d90e4e3e7

See also https://bugzilla.kernel.org/show_bug.cgi?id=49221

Signed-off-by: Oleksandr Chumachenko <ledest@gmail.com>
Signed-off-by: Michael Shigorin <mike@osdn.org.ua>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>