netlink: annotate lockless accesses to nlk->max_recvmsg_len

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                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/netlink/af_netlink.c"
                    ],
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                            "version": "6.3",
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