staging: fsl-dpaa2/eth: Use debug level for message

The driver remove() function prints a message when the operation
is completed. Make this a debug level message to avoid polluting
the kernel log wih too much information.

Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>