tmf: update ITmfEvent.getType().getName() to be getName()

tmf: update ITmfEvent.getType().getName() to be getName()

This could yield a performance boost
Also, substitute TmfUml2dSyncLoader's getType().toString()
with getName() as it is being used to get the event name

Change-Id: Ide3cb3f0a97f86d99f2e358f608dac107c730bef
Signed-off-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/45675
Reviewed-by: Hudson CI
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>