soc: dove: Use irq_desc_get_xxx() to avoid redundant lookup of irq_desc

Search and replace done with coccinelle

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Julia Lawall <Julia.Lawall@lip6.fr>
Cc: Jiang Liu <jiang.liu@linux.intel.com>