prep: fix I/O port endianness

Do not swap endianness here, it will happen during cpu_{in,out}{b,w,l}.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Reviewed-by: NAnthony Liguori <aliguori@us.ibm.com>
Message-id: 1374501278-31549-6-git-send-email-pbonzini@redhat.com
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/ppc/prep.c

@@ -410,7 +410,7 @@ static const MemoryRegionOps PPC_prep_io_ops = {
         .read = { PPC_prep_io_readb, PPC_prep_io_readw, PPC_prep_io_readl },
         .write = { PPC_prep_io_writeb, PPC_prep_io_writew, PPC_prep_io_writel },
     },
-    .endianness = DEVICE_LITTLE_ENDIAN,
+    .endianness = DEVICE_NATIVE_ENDIAN,
 };
 
 #define NVRAM_SIZE        0x2000