[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/kernel/irq-msc01.c b/arch/mips/kernel/irq-msc01.c
index f8cd1ac..63dfeb4 100644
--- a/arch/mips/kernel/irq-msc01.c
+++ b/arch/mips/kernel/irq-msc01.c
@@ -137,7 +137,7 @@
 
 #define shutdown_msc_irq	disable_msc_irq
 
-struct hw_interrupt_type msc_levelirq_type = {
+struct irq_chip msc_levelirq_type = {
 	.typename = "SOC-it-Level",
 	.startup = startup_msc_irq,
 	.shutdown = shutdown_msc_irq,
@@ -147,7 +147,7 @@
 	.end = end_msc_irq,
 };
 
-struct hw_interrupt_type msc_edgeirq_type = {
+struct irq_chip msc_edgeirq_type = {
 	.typename = "SOC-it-Edge",
 	.startup =startup_msc_irq,
 	.shutdown = shutdown_msc_irq,