hw/core/generic-loader: Set a category for the generic-loader device

Each device that is instantiatable by the users should be marked with
a category. Since the generic-loader does not fit anywhere else, put
it into the MISC category.
Reviewed-by: NAlistair Francis <alistair.francis@wdc.com>
Reviewed-by: NCornelia Huck <cohuck@redhat.com>
Signed-off-by: NThomas Huth <thuth@redhat.com>

hw/core/generic-loader.c

@@ -204,6 +204,7 @@ static void generic_loader_class_init(ObjectClass *klass, void *data)
     dc->unrealize = generic_loader_unrealize;
     dc->props = generic_loader_props;
     dc->desc = "Generic Loader";
+    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 }
 
 static TypeInfo generic_loader_info = {