staging: vt6655: Use ether_addr_copy function

This patch fixes the following checkpatch.pl warnings:
WARNING: "Prefer ether_addr_copy() over memcpy() if the Ethernet
addresses are __aligned(2)" in file iwctl.c
Pahole shows that the addresses are aligned
Signed-off-by: Dilek Uzulmez <dilekuzulmez@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6655/iwctl.c

@@ -1728,7 +1728,7 @@ int iwctl_siwencodeext(struct net_device *dev,
 		goto error;
 	}
 //recover addr
-	memcpy(addr, ext->addr.sa_data, ETH_ALEN);
+	ether_addr_copy(addr, ext->addr.sa_data);
 //recover key_idx
 	key_idx = (wrq->flags&IW_ENCODE_INDEX) - 1;
 //recover set_tx