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Since we want to be able to reschedule immediately from interrupt
handlers, the pipeline no longer fires the {enter, exit}_oob_irq()
notifiers which became useless.

Interrupt handlers must now call explicitly:

- evl_enter_irq() on entry to block rescheduling attempts
- evl_leave_irq() at exit to trigger a call to evl_schedule()
Signed-off-by: Philippe Gerum <rpm@xenomai.org>