net: dsa: microchip: rename shutdown to reset in ksz_dev_ops

This patch renames the shutdown to reset in ksz_dev_ops in order to use
the reset dev_ops in the ksz_setup.

Signed-off-by: Arun Ramadoss <arun.ramadoss@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>