Make simple io mem handler endian aware

As an alternative to the 3 individual handlers, there is also a simplified
io mem hook function. To be consistent, let's add an endianness parameter
there too.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/rwhandler.c b/rwhandler.c
index 88dfcc5..bb2238f 100644
--- a/rwhandler.c
+++ b/rwhandler.c
@@ -35,14 +35,14 @@
     &cpu_io_memory_simple_readl,
 };
 
-int cpu_register_io_memory_simple(struct ReadWriteHandler *handler)
+int cpu_register_io_memory_simple(struct ReadWriteHandler *handler, int endian)
 {
     if (!handler->read || !handler->write) {
         return -1;
     }
     return cpu_register_io_memory(cpu_io_memory_simple_read,
                                   cpu_io_memory_simple_write,
-                                  handler, DEVICE_NATIVE_ENDIAN);
+                                  handler, endian);
 }
 
 RWHANDLER_WRITE(ioport_simple_writeb, 1, uint32_t);