tools: bpftool: replace Netronome boilerplate with SPDX license headers

Replace the repeated license text with SDPX identifiers.

Signed-off-by: Jakub Kicinski <[email protected]>
Acked-by: Roman Gushchin <[email protected]>
Acked-by: YueHaibing <[email protected]>
Acked-by: Yonghong Song <[email protected]>
Acked-by: Stanislav Fomichev <[email protected]>
Acked-by: Sean Young <[email protected]>
Acked-by: Jiri Benc <[email protected]>
Acked-by: David Calavera <[email protected]>
Acked-by: Andrey Ignatov <[email protected]>
Acked-by: Joe Stringer <[email protected]>
Acked-by: David Ahern <[email protected]>
Acked-by: Alexei Starovoitov <[email protected]>
Acked-by: Petar Penkov <[email protected]>
Acked-by: Sandipan Das <[email protected]>
Acked-by: Prashant Bhole <[email protected]>
Acked-by: Stephen Hemminger <[email protected]>
Acked-by: John Fastabend <[email protected]>
Acked-by: Taeung Song <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Acked-by: Daniel Borkmann <[email protected]>
CC: [email protected]
Signed-off-by: Daniel Borkmann <[email protected]>

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