net: annotate data-races around sk->sk_tx_queue_mapping

[ Upstream commit 0bb4d124d34044179b42a769a0c76f389ae973b6 ]

This field can be read or written without socket lock being held.

Add annotations to avoid load-store tearing.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>