genirq/debugfs: Add missing irqchip flags

Recently introduced irqchip flags lack the corresponding printouts in
debugfs. Add them.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/874kpvydxc.wl-maz@kernel.org