macio: Fix timer endianness

The timer registers on our KeyLargo macio emulation are read as byte reversed
from the big endian guest, so we better expose them endian reversed as well.

This fixes initial hickups of booting Mac OS X with -M mac99 for me.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Tested-by: NMark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

hw/misc/macio/macio.c

@@ -259,7 +259,7 @@ static uint64_t timer_read(void *opaque, hwaddr addr, unsigned size)
 static const MemoryRegionOps timer_ops = {
     .read = timer_read,
     .write = timer_write,
-    .endianness = DEVICE_NATIVE_ENDIAN,
+    .endianness = DEVICE_LITTLE_ENDIAN,
 };
 
 static int macio_newworld_initfn(PCIDevice *d)