ppc64 iseries: move some iSeries include files

These files are only referenced from within
arch/powerpc/platforms/iseries, so move them there.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
diff --git a/arch/powerpc/platforms/iseries/pci.c b/arch/powerpc/platforms/iseries/pci.c
index 501b1dc..70185de 100644
--- a/arch/powerpc/platforms/iseries/pci.c
+++ b/arch/powerpc/platforms/iseries/pci.c
@@ -37,12 +37,13 @@
 
 #include <asm/iSeries/HvCallPci.h>
 #include <asm/iSeries/HvCallXm.h>
-#include <asm/iSeries/iSeries_irq.h>
 #include <asm/iSeries/iSeries_pci.h>
 #include <asm/iSeries/mf.h>
 
 #include <asm/ppc-pci.h>
 
+#include "irq.h"
+
 extern unsigned long io_page_mask;
 
 /*