drivers/net/xilinx_ll_temac.c: Fix compile warning

Fix this:
xilinx_ll_temac.c: In function 'xilinx_ll_temac_initialize':
xilinx_ll_temac.c:332: warning: assignment from incompatible pointer type
xilinx_ll_temac.c:340: warning: assignment from incompatible pointer type

Signed-off-by: Stephan Linz <linz@li-pro.net>
diff --git a/drivers/net/xilinx_ll_temac_fifo.c b/drivers/net/xilinx_ll_temac_fifo.c
index 3ff0f34..d7fd989 100644
--- a/drivers/net/xilinx_ll_temac_fifo.c
+++ b/drivers/net/xilinx_ll_temac_fifo.c
@@ -102,8 +102,7 @@
 	return 0;
 }
 
-int ll_temac_send_fifo(struct eth_device *dev, volatile void *packet,
-							int length)
+int ll_temac_send_fifo(struct eth_device *dev, void *packet, int length)
 {
 	int i;
 	u32 *buf = (u32 *)packet;