dpaa2-mac: do not check for both child and parent DTS nodes

There is no need to check if both the MDIO controller node and its
child node, the PCS device, are available since there is no chance that
the child node would be enabled when the parent it's not.
Suggested-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NIoana Ciornei <ioana.ciornei@nxp.com>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c

@@ -267,8 +267,7 @@ static int dpaa2_pcs_create(struct dpaa2_mac *mac,
 		return 0;
 	}
 
-	if (!of_device_is_available(node) ||
-	    !of_device_is_available(node->parent)) {
+	if (!of_device_is_available(node)) {
 		netdev_err(mac->net_dev, "pcs-handle node not available\n");
 		return -ENODEV;
 	}