memory: Let ReservedRegion use Range

A reserved region is a range tagged with a type. Let's directly use
the Range type in the prospect to reuse some of the library helpers
shipped with the Range type.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: "Michael S. Tsirkin" <mst@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>

include/exec/memory.h

@@ -24,6 +24,7 @@
 #include "qemu/bswap.h"
 #include "qemu/queue.h"
 #include "qemu/int128.h"
+#include "qemu/range.h"
 #include "qemu/notify.h"
 #include "qom/object.h"
 #include "qemu/rcu.h"
@@ -79,8 +80,7 @@ extern unsigned int global_dirty_tracking;
 typedef struct MemoryRegionOps MemoryRegionOps;
 
 struct ReservedRegion {
-    hwaddr low;
-    hwaddr high;
+    Range range;
     unsigned type;
 };