net/nuc900: enable Mac driver clock

This patch fixed a bug that Mac driver does not work,because I missed the clk enable.

I have ever tested the driver when I submitted previous Mac driver patch,
and it worked good, since my bootloader has enabled the clock in advance.

But when I try to use other bootloader where clock engine was disabled,the
Mac driver does not work, so I send this patch to fix this issue.
Signed-off-by: NWan ZongShun <mcuos.com@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/arm/w90p910_ether.c

@@ -822,6 +822,9 @@ static int w90p910_ether_open(struct net_device *dev)
 	w90p910_set_global_maccmd(dev);
 	w90p910_enable_rx(dev, 1);
 
+	clk_enable(ether->rmiiclk);
+	clk_enable(ether->clk);
+
 	ether->rx_packets = 0x0;
 	ether->rx_bytes = 0x0;