os.linux: Manage sched_waking events

os.linux: Manage sched_waking events

LTTng 2.8 (and kernels around that time) introduced the
sched_waking event. This event has the same fields as the
sched_wakeup one, and should cause the same state changes.

Since the linux-generic KernelStateProvider has no knowledge
of specific LTTng event layouts, we have to bring this
definition up into the base interface. Older traces simply
won't have any of these events.

Change-Id: Idf9eaf1ecba0346b22283adfbe71ad56d52b045f
Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Reviewed-on: https://git.eclipse.org/r/85804
Reviewed-by: Hudson CI
Reviewed-by: Genevieve Bastien <gbastien+lttng@versatic.net>
Tested-by: Genevieve Bastien <gbastien+lttng@versatic.net>