ethernet: ti: davinci_emac: add missing of_node_put after calling of_parse_phandle

commit 5817f977527e5cdbea9ca56d2b95824f59c8747d upstream.

of_node_put needs to be called when the device node which is got
from of_parse_phandle has finished using.

Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: SZ Lin (林上智) <sz.lin@moxa.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>