perf scripts python: export-to-sqlite.py: Export calls parent_id

Export to the 'calls' table the newly created 'parent_id'.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: https://lkml.kernel.org/n/tip-b09oukl48rsl9azkp2wmh0bl@git.kernel.org


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