[ARM] 4450/1: pxa: add pxa25x_init_irq() and pxa27x_init_irq()

/* should be ok this time, I aligned this patch to your arm:pxa2.mbox */

1. move pxa25x specific IRQ initialization code to pxa25x_init_irq()
and pxa27x code to pxa27x_init_irq(), remove pxa_init_irq()

2. replace all pxa_init_irq() with their PXA25x or PXA27x specific
functions

Signed-off-by: eric miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-pxa/trizeps4.c b/arch/arm/mach-pxa/trizeps4.c
index 28c79bd..47a1f7e 100644
--- a/arch/arm/mach-pxa/trizeps4.c
+++ b/arch/arm/mach-pxa/trizeps4.c
@@ -503,7 +503,7 @@
 	.boot_params	= TRIZEPS4_SDRAM_BASE + 0x100,
 	.init_machine	= trizeps4_init,
 	.map_io		= trizeps4_map_io,
-	.init_irq	= pxa_init_irq,
+	.init_irq	= pxa27x_init_irq,
 	.timer		= &pxa_timer,
 MACHINE_END