net: use eth_hw_addr_random() and reset addr_assign_type

Use eth_hw_addr_random() instead of calling random_ether_addr()
to set addr_assign_type correctly to NET_ADDR_RANDOM.

Reset the state to NET_ADDR_PERM as soon as the MAC get
changed via .ndo_set_mac_address.

v2: adapt to renamed eth_hw_addr_random()

Signed-off-by: Danny Kukawka <danny.kukawka@bisect.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/microchip/enc28j60.c b/drivers/net/ethernet/microchip/enc28j60.c
index 1d6b7ce..6118bda 100644
--- a/drivers/net/ethernet/microchip/enc28j60.c
+++ b/drivers/net/ethernet/microchip/enc28j60.c
@@ -527,6 +527,7 @@
 	if (!is_valid_ether_addr(address->sa_data))
 		return -EADDRNOTAVAIL;
 
+	dev->addr_assign_type &= ~NET_ADDR_RANDOM;
 	memcpy(dev->dev_addr, address->sa_data, dev->addr_len);
 	return enc28j60_set_hw_macaddr(dev);
 }
@@ -1575,7 +1576,7 @@
 		ret = -EIO;
 		goto error_irq;
 	}
-	random_ether_addr(dev->dev_addr);
+	eth_hw_addr_random(dev);
 	enc28j60_set_hw_macaddr(dev);
 
 	/* Board setup must set the relevant edge trigger type;