hv_netvsc: Set VF priv_flags to IFF_NO_ADDRCONF before open to prevent IPv6 addrconf

jira LE-4365
Rebuild_History Non-Buildable kernel-6.12.0-55.38.1.el10_0
commit-author Li Tian <litian@redhat.com>
commit d7501e0

Set an additional flag IFF_NO_ADDRCONF to prevent ipv6 addrconf.

Commit under Fixes added a new flag change that was not made
to hv_netvsc resulting in the VF being assinged an IPv6.

Fixes: 8a321cf ("net: add IFF_NO_ADDRCONF and use it in bonding to prevent ipv6 addrconf")
	Suggested-by: Cathy Avery <cavery@redhat.com>
	Signed-off-by: Li Tian <litian@redhat.com>
	Reviewed-by: Xin Long <lucien.xin@gmail.com>
Link: https://patch.msgid.link/20250716002607.4927-1-litian@redhat.com
	Signed-off-by: Jakub Kicinski <kuba@kernel.org>
(cherry picked from commit d7501e0)
	Signed-off-by: Jonathan Maple <jmaple@ciq.com>

Author: PlaidCat

drivers/net/hyperv/netvsc_drv.c

@@ -2350,8 +2350,11 @@ static int netvsc_prepare_bonding(struct net_device *vf_netdev)
 	if (!ndev)
 		return NOTIFY_DONE;
 
-	/* set slave flag before open to prevent IPv6 addrconf */
+	/* Set slave flag and no addrconf flag before open
+	 * to prevent IPv6 addrconf.
+	 */
 	vf_netdev->flags |= IFF_SLAVE;
+	vf_netdev->priv_flags |= IFF_NO_ADDRCONF;
 	return NOTIFY_DONE;
 }