libbpf: Add 6th argument support for x86-64 in bpf_tracing.h

Add r9 as register containing 6th argument on x86-64 architecture, as
per its ABI. Add also a link to a page describing ABI for easier future
reference.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20230120200914.3008030-3-andrii@kernel.org