[POWERPC] iSeries_init_IRQ non-PCI tidy

ppc_md.init_IRQ is not called if it is NULL, so we don't need an empty
routine in the non PCI case.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/iseries/irq.h

 #ifndef	_ISERIES_IRQ_H
 #define	_ISERIES_IRQ_H
 
+#ifdef CONFIG_PCI
 extern void iSeries_init_IRQ(void);
 extern int  iSeries_allocate_IRQ(HvBusNumber, HvSubBusNumber, u32);
 extern void iSeries_activate_IRQs(void);
+#else
+#define iSeries_init_IRQ	NULL
+#endif
 extern unsigned int iSeries_get_irq(void);
 
 #endif /* _ISERIES_IRQ_H */

arch/powerpc/platforms/iseries/setup.c

@@ -617,10 +617,6 @@ static void iseries_dedicated_idle(void)
 	}
 }
 
-#ifndef CONFIG_PCI
-void __init iSeries_init_IRQ(void) { }
-#endif
-
 static void __iomem *iseries_ioremap(phys_addr_t address, unsigned long size,
 				     unsigned long flags)
 {