staging: ced1401: remove driver

The state of the driver hasn't improved much since it was added to
staging, and no one with the hardware is currently working on it, so
remove it. This commit can be reverted if someone wants to clean the
driver up and move it to its proper place in the kernel.

Signed-off-by: Kristina Martšenko <kristina.martsenko@gmail.com>
Cc: Greg Smith <greg@ced.co.uk>
Cc: Alois Schlögl <alois.schloegl@ist.ac.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>