[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/sibyte/bcm1480/irq.c b/arch/mips/sibyte/bcm1480/irq.c
index 29d3bbb..2c5afb4 100644
--- a/arch/mips/sibyte/bcm1480/irq.c
+++ b/arch/mips/sibyte/bcm1480/irq.c
@@ -83,7 +83,7 @@
 #endif
 #endif
 
-static struct hw_interrupt_type bcm1480_irq_type = {
+static struct irq_chip bcm1480_irq_type = {
 	.typename = "BCM1480-IMR",
 	.startup = startup_bcm1480_irq,
 	.shutdown = shutdown_bcm1480_irq,
@@ -140,7 +140,7 @@
 {
 	int i = 0, old_cpu, cpu, int_on, k;
 	u64 cur_ints;
-	irq_desc_t *desc = irq_desc + irq;
+	struct irq_desc *desc = irq_desc + irq;
 	unsigned long flags;
 	unsigned int irq_dirty;
 
@@ -278,7 +278,7 @@
 			irq_desc[i].chip = &bcm1480_irq_type;
 			bcm1480_irq_owner[i] = 0;
 		} else {
-			irq_desc[i].chip = &no_irq_type;
+			irq_desc[i].chip = &no_irq_chip;
 		}
 	}
 }
@@ -301,7 +301,7 @@
 
 int bcm1480_steal_irq(int irq)
 {
-	irq_desc_t *desc = irq_desc + irq;
+	struct irq_desc *desc = irq_desc + irq;
 	unsigned long flags;
 	int retval = 0;