perf trace: Mark which syscall arguments go from user space to kernel space

We need to know where to collect it in the BPF augmenters, if in the
sys_enter hook or in the sys_exit hook.

Start with the SCA_FILENAME one, that is just from user to kernel space.

The alternative, better, but takes a bit more time than I have now, is
to use the __user information that is already in the syscall args and
encoded in BTF via a tag, do it later.

Cc: Adrian Hunter <[email protected]>
Cc: Howard Chu <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Namhyung Kim <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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