of/platform: export of_default_bus_match_table

Currently, drivers/bus/uniphier-system-bus.c is kept from being a
module due to the unresolved reference to of_default_bus_match_table.

Refer to commit 326ea45a ("bus: uniphier: allow only built-in
driver").
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Rob Herring <robh@kernel.org>

drivers/of/platform.c

@@ -31,6 +31,7 @@ const struct of_device_id of_default_bus_match_table[] = {
 #endif /* CONFIG_ARM_AMBA */
 	{} /* Empty terminated list */
 };
+EXPORT_SYMBOL(of_default_bus_match_table);
 
 static int of_dev_node_match(struct device *dev, void *data)
 {