Impact: fix boot hang on a G5

In set_irq_type() we want to pass the type rather than the current
interrupt state.
Signed-off-by: Chris Friesen <cfriesen@nortel.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>