perf augmented_raw_syscalls: Rename augmented_args_filename to augmented_args_payload

It'll get other stuff in there than just filenames, starting with
sockaddr for 'connect' and 'bind'.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-bsexidtsn91ehdpzcd6n5fm9@git.kernel.org


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>