[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/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)
 {