isa_mmio: Always use little endian

This patch converts the ISA MMIO bridge code to always use little endian mmio.
All bswap code that existed was only there to convert from native cpu
endianness to little endian ISA devices.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/hw/ppce500_mpc8544ds.c b/hw/ppce500_mpc8544ds.c
index 59d20d3..b7670ae 100644
--- a/hw/ppce500_mpc8544ds.c
+++ b/hw/ppce500_mpc8544ds.c
@@ -220,7 +220,7 @@
     if (!pci_bus)
         printf("couldn't create PCI controller!\n");
 
-    isa_mmio_init(MPC8544_PCI_IO, MPC8544_PCI_IOLEN, 1);
+    isa_mmio_init(MPC8544_PCI_IO, MPC8544_PCI_IOLEN);
 
     if (pci_bus) {
         /* Register network interfaces. */