[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/au1000/common/irq.c b/arch/mips/au1000/common/irq.c
index 29d6f81..316722e 100644
--- a/arch/mips/au1000/common/irq.c
+++ b/arch/mips/au1000/common/irq.c
@@ -251,7 +251,7 @@
 }
 
 
-static struct hw_interrupt_type rise_edge_irq_type = {
+static struct irq_chip rise_edge_irq_type = {
 	.typename = "Au1000 Rise Edge",
 	.startup = startup_irq,
 	.shutdown = shutdown_irq,
@@ -261,7 +261,7 @@
 	.end = end_irq,
 };
 
-static struct hw_interrupt_type fall_edge_irq_type = {
+static struct irq_chip fall_edge_irq_type = {
 	.typename = "Au1000 Fall Edge",
 	.startup = startup_irq,
 	.shutdown = shutdown_irq,
@@ -271,7 +271,7 @@
 	.end = end_irq,
 };
 
-static struct hw_interrupt_type either_edge_irq_type = {
+static struct irq_chip either_edge_irq_type = {
 	.typename = "Au1000 Rise or Fall Edge",
 	.startup = startup_irq,
 	.shutdown = shutdown_irq,
@@ -281,7 +281,7 @@
 	.end = end_irq,
 };
 
-static struct hw_interrupt_type level_irq_type = {
+static struct irq_chip level_irq_type = {
 	.typename = "Au1000 Level",
 	.startup = startup_irq,
 	.shutdown = shutdown_irq,