powerpc: Move iSeries_pci.c to powerpc/platform/iseries

and rename it to pci.c.  This also required moving
arch/ppc64/kernel/pci.h into include/asm-powerpc (called
ppc-pci.h.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
diff --git a/arch/ppc64/kernel/pci_dn.c b/arch/ppc64/kernel/pci_dn.c
index a86389d..493bbe4 100644
--- a/arch/ppc64/kernel/pci_dn.c
+++ b/arch/ppc64/kernel/pci_dn.c
@@ -30,8 +30,7 @@
 #include <asm/prom.h>
 #include <asm/pci-bridge.h>
 #include <asm/pSeries_reconfig.h>
-
-#include "pci.h"
+#include <asm/ppc-pci.h>
 
 /*
  * Traverse_func that inits the PCI fields of the device node.