libbpf: Fix arm and arm64 specs in bpf_tracing.h

Remove invalid support for PARM5 on 32-bit arm, as per ABI. Add three
more argument registers for arm64. Also leave links to ABI specs for
future reference.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Alan Maguire <alan.maguire@oracle.com> # arm64
Link: https://lore.kernel.org/bpf/20230120200914.3008030-4-andrii@kernel.org