[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/sgi-ip22/ip22-eisa.c b/arch/mips/sgi-ip22/ip22-eisa.c
index ce8e4a7..ee0514a 100644
--- a/arch/mips/sgi-ip22/ip22-eisa.c
+++ b/arch/mips/sgi-ip22/ip22-eisa.c
@@ -144,7 +144,7 @@
 		enable_eisa1_irq(irq);
 }
 
-static struct hw_interrupt_type ip22_eisa1_irq_type = {
+static struct irq_chip ip22_eisa1_irq_type = {
 	.typename	= "IP22 EISA",
 	.startup	= startup_eisa1_irq,
 	.shutdown	= shutdown_eisa1_irq,
@@ -206,7 +206,7 @@
 		enable_eisa2_irq(irq);
 }
 
-static struct hw_interrupt_type ip22_eisa2_irq_type = {
+static struct irq_chip ip22_eisa2_irq_type = {
 	.typename	= "IP22 EISA",
 	.startup	= startup_eisa2_irq,
 	.shutdown	= shutdown_eisa2_irq,