Squash to "selftests/bpf: Add bpf_burst scheduler"

Fix the bpf selftests build error:

progs/mptcp_bpf_burst.c:37:18: error: no member named 'write_seq' in 'struct tcp_sock'
        return tp ? tp->write_seq == tp->snd_nxt : true;
                    ~~  ^
1 error generated.
make: *** [Makefile:614: tools/testing/selftests/bpf/mptcp_bpf_burst.bpf.o] Error 1
make: *** Waiting for unfinished jobs....

Reported-by: kernel test robot <yujie.liu@intel.com>
Closes: https://lore.kernel.org/r/202311180438.KHYloYBe-lkp@intel.com/
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Message-Id: <14a1120c9bc792ead2b926208ce85b5f10cb99fd.1700624540.git.geliang.tang@suse.com>

tools/testing/selftests/bpf/bpf_tcp_helpers.h

@@ -87,6 +87,7 @@ struct tcp_sock {
 	__u32	lsndtime;
 	__u32	prior_cwnd;
 	__u64	tcp_mstamp;	/* most recent packet received/sent */
+	__u32	write_seq;	/* Tail(+1) of data held in tcp send buffer */
 	bool	is_mptcp;
 } __attribute__((preserve_access_index));