[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/vr41xx/nec-cmbvr4133/irq.c b/arch/mips/vr41xx/nec-cmbvr4133/irq.c
index 7b2511c..2483487 100644
--- a/arch/mips/vr41xx/nec-cmbvr4133/irq.c
+++ b/arch/mips/vr41xx/nec-cmbvr4133/irq.c
@@ -62,7 +62,7 @@
 		enable_8259A_irq(irq - I8259_IRQ_BASE);
 }
 
-static struct hw_interrupt_type i8259_irq_type = {
+static struct irq_chip i8259_irq_type = {
 	.typename       = "XT-PIC",
 	.startup        = startup_i8259_irq,
 	.shutdown       = shutdown_i8259_irq,