tcp: annotate data-races around rskq_defer_accept

[ Upstream commit ae488c74 ]

do_tcp_getsockopt() reads rskq_defer_accept while another cpu
might change its value.

Fixes: 1da177e4

 ("Linux-2.6.12-rc2")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20230719212857.3943972-9-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>