net: annotate data-races around sk->sk_tx_queue_mapping

stable inclusion
from stable-v4.19.300
commit bd4f1843a141fc77995108b08d9cc07f67d5d894
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8UH13


CVE: NA

--------------------------------

[ 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>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>