of: Provide static inline function for of_translate_address if needed

If OF_ADDRESS is not configured, builds can fail with errors such as

drivers/net/ethernet/hisilicon/hns_mdio.c:
	In function 'hns_mdio_bus_name':
drivers/net/ethernet/hisilicon/hns_mdio.c:411:3:
	error: implicit declaration of function 'of_translate_address'

as currently seen when building sparc:allmodconfig.

Introduce a static inline function if OF_ADDRESS is not configured to fix
the build failure. Return OF_BAD_ADDR in this case. For this to work, the
definition of OF_BAD_ADDR has to be moved outside CONFIG_OF conditional
code.

Fixes: 876133d3161d ("net: hisilicon: add OF dependency")
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Frank Rowand <frank.rowand@sonymobile.com>
Signed-off-by: Rob Herring <robh@kernel.org>
diff --git a/include/linux/of_address.h b/include/linux/of_address.h
index d88e81b..507daad 100644
--- a/include/linux/of_address.h
+++ b/include/linux/of_address.h
@@ -57,6 +57,13 @@
 				u64 *paddr, u64 *size);
 extern bool of_dma_is_coherent(struct device_node *np);
 #else /* CONFIG_OF_ADDRESS */
+
+static inline u64 of_translate_address(struct device_node *np,
+				       const __be32 *addr)
+{
+	return OF_BAD_ADDR;
+}
+
 static inline struct device_node *of_find_matching_node_by_address(
 					struct device_node *from,
 					const struct of_device_id *matches,