scripts: add a filter for LTTng events

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
tracepoints: fix the provider name

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
tracepoints: add macro to create tracepoints

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>