powerpc: Move isa bridge definitions to separate include

We'll be adding non-PCI isa bridge support so let's not
have all the definition in pci-bridge.h

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/platforms/maple/pci.c

@@ -24,6 +24,7 @@
 #include <asm/machdep.h>
 #include <asm/iommu.h>
 #include <asm/ppc-pci.h>
+#include <asm/isa-bridge.h>
 
 #include "maple.h"