Merge branch 'selftests-bpf-retire-bpf_tcp_helpers-h'

Martin KaFai Lau says:

====================
selftests/bpf: Retire bpf_tcp_helpers.h

From: Martin KaFai Lau <martin.lau@kernel.org>

The earlier commit 8e6d9ae2e09f ("selftests/bpf: Use bpf_tracing.h instead of bpf_tcp_helpers.h")
removed the bpf_tcp_helpers.h usages from the non networking tests.

This patch set is a continuation of this effort to retire
the bpf_tcp_helpers.h from the networking tests (mostly tcp-cc related).

The main usage of the bpf_tcp_helpers.h is the partial kernel
socket definitions (e.g. sock, tcp_sock). New fields are kept adding
back to those partial socket definitions while everything is available
in the vmlinux.h. The recent bpf_cc_cubic.c test tried to extend
bpf_tcp_helpers.c but eventually used the vmlinux.h instead. To avoid
this unnecessary detour for new tests and have one consistent way
of using the kernel sockets, this patch set retires the bpf_tcp_helpers.h
usages and consolidates the tests to use vmlinux.h instead.
====================

Link: https://lore.kernel.org/r/20240509175026.3423614-1-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>