lttng: move changes of updates to meta-mentor-staging

JIRA: SB-3098

We need this fix for MEL and ATP, so move it to common layer
meta-mentor-staging.

Signed-off-by: Srikanth Krishnakar <Srikanth_Krishnakar@mentor.com>
Merge pull request #19 from skrishnakar/move-lttng-to-staging

Move lttng fixes to meta-mentor-staging