selftests/bpf: fix RELEASE=1 build for tc_opts

Compiler complains about malloc(). We also don't need to dynamically
allocate anything, so make the life easier by using statically sized
buffer.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20231102033759.2541186-2-andrii@kernel.org


Signed-off-by: Alexei Starovoitov <ast@kernel.org>