timing.core: use symbol aspect directly on call graph segment's getName()

timing.core: use symbol aspect directly on call graph segment's getName()

getName() is a presentation level getter, it only makes sense to resolve
the symbol there.

Change-Id: Ifebaad310b79e7974dfbc1ce95298fab34721cf4
Signed-off-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/96062
Reviewed-by: Hudson CI
Reviewed-by: Loic Prieur-Drevon <loic.prieurdrevon@gmail.com>
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>