bpf: Document BPF licensing.

Document and clarify BPF licensing.

Signed-off-by: Alexei Starovoitov <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Acked-by: Toke Høiland-Jørgensen <[email protected]>
Acked-by: Daniel Borkmann <[email protected]>
Acked-by: Joe Stringer <[email protected]>
Acked-by: Lorenz Bauer <[email protected]>
Acked-by: Dave Thaler <[email protected]>
Acked-by: Stephen Hemminger <[email protected]>
Acked-by: Jesper Dangaard Brouer <[email protected]>
Acked-by: KP Singh <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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