tools include uapi bpf.h: Sync kernel ABI header with tooling header

tools include uapi bpf.h: Sync kernel ABI header with tooling header

Silences the checker:

  Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'

The 90caccdd8cc0 ("bpf: fix bpf_tail_call() x64 JIT") cset only updated
a comment in uapi/bpf.h.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-rwx2cqbf0x1lwa1krsr6e6hd@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>