bluetooth: use eth_hw_addr_set()

Commit 406f42fa ("net-next: When a bond have a massive amount
of VLANs...") introduced a rbtree for faster Ethernet address look
up. To maintain netdev->dev_addr in this tree we need to make all
the writes to it go through appropriate helpers.

Convert bluetooth from memcpy(... ETH_ADDR) to eth_hw_addr_set():

  @@
  expression dev, np;
  @@
  - memcpy(dev->dev_addr, np, ETH_ALEN)
  + eth_hw_addr_set(dev, np)
Reviewed-by: Marcel Holtmann <marcel@holtmann.org>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/bluetooth/bnep/core.c

@@ -594,7 +594,7 @@ int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock)
 	 * ie. eh.h_dest is our local address. */
 	memcpy(s->eh.h_dest,   &src, ETH_ALEN);
 	memcpy(s->eh.h_source, &dst, ETH_ALEN);
-	memcpy(dev->dev_addr, s->eh.h_dest, ETH_ALEN);
+	eth_hw_addr_set(dev, s->eh.h_dest);
 
 	s->dev   = dev;
 	s->sock  = sock;