Staging: pata_rdc: remove the driver from the staging tree

Now that a "real" driver is in the libata tree for this hardware, we need
to remove the staging driver as it is no longer needed.

Cc: Kevin Huang  <Kevin.Huang@rdc.com.tw>
Cc: Tomy Wang <Tomy.Wang@rdc.com.tw>
Cc: Alan Cox <alan@linux.intel.com>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>