drivers/net/ks8695eth.c: Fix compile warning

Fix this:
ks8695eth.c: In function 'ks8695_eth_initialize':
ks8695eth.c:236:12: warning: assignment from incompatible pointer type

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Cc: Joe Hershberger <joe.hershberger@gmail.com>

drivers/net/ks8695eth.c

@@ -190,8 +190,7 @@ static int ks8695_eth_recv(struct eth_device *dev)
 
 /****************************************************************************/
 
-static int ks8695_eth_send(struct eth_device *dev, volatile void *packet,
-	int len)
+static int ks8695_eth_send(struct eth_device *dev, void *packet, int len)
 {
 	volatile struct ks8695_txdesc *dp;
 	static int next = 0;