linux-imx

genirq: Simplify irq_data_to_desc()

Avoid the lookup of irq_desc and use the same mechanism for
hierarchical and flat irqdomains.

Based-on-a-patch-from: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>