sh: IPR/INTC2 IRQ setup consolidation.

This patch unifies the cpu specific interrupt setup functions for
interrupt controller blocks such as ipr, intc2 and intc. There is no
point in having separate functions for each interrupt controller, so
let's clean this up.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/cpu/sh2a/setup-sh7206.c

@@ -107,7 +107,7 @@ static struct ipr_desc ipr_irq_desc = {
 	},
 };
 
-void __init init_IRQ_ipr(void)
+void __init plat_irq_setup(void)
 {
 	register_ipr_controller(&ipr_irq_desc);
 }