selftests/bpf: Copy over libbpf configs

This change integrates libbpf maintained configurations and black/white
lists [0] into the repository, co-located with the BPF selftests themselves.
We minimize the kernel configurations to keep future updates as small as
possible [1].

Furthermore, we make both kernel configurations build on top of the existing
configuration tools/testing/selftests/bpf/config (to be concatenated before
build). Lastly, we replaced the terms blacklist & whitelist with denylist and
allowlist, respectively.

  [0] https://github.com/libbpf/libbpf/tree/20f03302350a4143825cedcbd210c4d7112c1898/travis-ci/vmtest/configs
  [1] https://lore.kernel.org/bpf/[email protected]/T/#m30a53648352ed494e556ac003042a9ad0a8f98c6

Signed-off-by: Daniel Müller <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Acked-by: Martin KaFai Lau <[email protected]>
Acked-by: Mykola Lysenko <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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