github: Test AF_XDP build using libbpf instead of kernel sources.

AF_XDP bits was removed from kernel's libbpf in 6.0.  libbpf
and libxdp are now primary way to build AF_XDP applications.
Most of modern distributions are already packaging some version
of libbpf, so it's better to test building with it instead
of building old unsupported kernel tree.

Ubuntu started packaging libxdp only in 22.10, so not using
it for now.

Kernel build infrastructure in CI scripts is not needed anymore.
Removed.

Acked-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

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