[MIPS] Eleminate interrupt migration helper use.

> #define hw_interrupt_type       irq_chip
> typedef struct irq_chip         hw_irq_controller;
> #define no_irq_type             no_irq_chip
> typedef struct irq_desc         irq_desc_t;

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/ite-boards/generic/irq.c b/arch/mips/ite-boards/generic/irq.c
index a6749c5..cb59ca4 100644
--- a/arch/mips/ite-boards/generic/irq.c
+++ b/arch/mips/ite-boards/generic/irq.c
@@ -133,7 +133,7 @@
 		enable_it8172_irq(irq);
 }
 
-static struct hw_interrupt_type it8172_irq_type = {
+static struct irq_chip it8172_irq_type = {
 	.typename = "ITE8172",
 	.startup = startup_ite_irq,
 	.shutdown = shutdown_ite_irq,
@@ -153,7 +153,7 @@
 #define shutdown_none	disable_none
 #define end_none	enable_none
 
-static struct hw_interrupt_type cp0_irq_type = {
+static struct irq_chip cp0_irq_type = {
 	.typename = "CP0 Count",
 	.startup = startup_none,
 	.shutdown = shutdown_none,