ARM: pxa: prepare pxa25x interrupts for device-tree platforms

Add the device-tree interrupts initialization function required to have
a generic pxa25x device-tree machine.
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>

arch/arm/mach-pxa/generic.h

@@ -27,6 +27,7 @@ extern void pxa_timer_init(void);
 
 #define pxa25x_handle_irq icip_handle_irq
 extern int __init pxa25x_clocks_init(void);
+extern void __init pxa25x_dt_init_irq(void);
 extern void __init pxa25x_init_irq(void);
 extern void __init pxa25x_map_io(void);
 extern void __init pxa26x_init_irq(void);

arch/arm/mach-pxa/pxa25x.c

@@ -151,6 +151,12 @@ void __init pxa26x_init_irq(void)
 }
 #endif
 
+void __init pxa25x_dt_init_irq(void)
+{
+	if (IS_ENABLED(CONFIG_OF))
+		pxa_dt_irq_init(pxa25x_set_wake);
+}
+
 static struct map_desc pxa25x_io_desc[] __initdata = {
 	{	/* Mem Ctl */
 		.virtual	= (unsigned long)SMEMC_VIRT,