[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/lpd270.c b/arch/arm/mach-pxa/lpd270.c
index e309766..7949f60 100644
--- a/arch/arm/mach-pxa/lpd270.c
+++ b/arch/arm/mach-pxa/lpd270.c
@@ -97,7 +97,7 @@
 {
 	int irq;
 
-	pxa_init_irq();
+	pxa27x_init_irq();
 
 	__raw_writew(0, LPD270_INT_MASK);
 	__raw_writew(0, LPD270_INT_STATUS);