buildroot

dbus-triggerd: add license file

In absence of license file, use source file as a license file since it
has license header in comments.

Signed-off-by: Rahul Bedarkar <rahul.bedarkar@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
(cherry picked from commit 50284570fbefa37c8874b47cd5998bd890e54632)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>