libbpf: Fix license for btf_relocate.c

License should be

// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)

...as with other libbpf files.

Fixes: 19e00c89 ("libbpf: Split BTF relocation")
Reported-by: Neill Kapron <nkapron@google.com>
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/bpf/20240810093504.2111134-1-alan.maguire@oracle.com