USB: usb-storage: unusual_devs entry for CamSport Evo

This patch (as1438) adds an unusual_devs entry for the MagicPixel
FW_Omega2 chip, used in the CamSport Evo camera.  The firmware
incorrectly reports a vendor-specific bDeviceClass.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by:  <ttkspam@free.fr>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>