tmf: Remove the "event type" from AbstractTmfStateProvider

tmf: Remove the "event type" from AbstractTmfStateProvider

Everybody was just asking for either ITmfEvent.class or TmfEvent.class,
so there's no point offering the option. This will avoid a potentially
costly isInstance() check for EVERY SINGLE event going through a state
provider.

If a state provider really needs a specific event type, they can do an
instanceof check in their handler methods.

Change-Id: I5486559ab5f566843c3006fefe2ce669a4171e5a
Signed-off-by: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
Reviewed-on: https://git.eclipse.org/r/39634
Reviewed-by: Hudson CI
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>