bcma: fix build when CONFIG_OF_ADDRESS is not set

Commit 2101e533 ("bcma: register bcma as device tree driver")
introduces a hard dependency on OF_ADDRESS into the bcma driver.
OF_ADDRESS is specifically disabled for the sparc architecture.
This results in the following error when building sparc64:allmodconfig.

drivers/bcma/main.c: In function 'bcma_of_find_child_device':
drivers/bcma/main.c:150:3: error: implicit declaration of function 'of_translate_address'

Fixes: 2101e533 ("bcma: register bcma as device tree driver")
Reported-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NHauke Mehrtens <hauke@hauke-m.de>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/bcma/main.c

@@ -132,7 +132,7 @@ static bool bcma_is_core_needed_early(u16 core_id)
 	return false;
 }
 
-#ifdef CONFIG_OF
+#if defined(CONFIG_OF) && defined(CONFIG_OF_ADDRESS)
 static struct device_node *bcma_of_find_child_device(struct platform_device *parent,
 						     struct bcma_device *core)
 {