of: Move of_device_(add|register|unregister) to of_platform.h

As of_device_(add|register|unregister) functions work on struct
platform_device, they should be declared in of_platform.h instead.

This move is transparent for now as both headers include each other.

Link: https://lore.kernel.org/r/20230329-dt-cpu-header-cleanups-v1-2-581e2605fe47@kernel.orgSigned-off-by: Rob Herring <robh@kernel.org>

include/linux/of_device.h

@@ -26,10 +26,6 @@ static inline int of_driver_match_device(struct device *dev,
 	return of_match_device(drv->of_match_table, dev) != NULL;
 }
 
-extern int of_device_add(struct platform_device *pdev);
-extern int of_device_register(struct platform_device *ofdev);
-extern void of_device_unregister(struct platform_device *ofdev);
-
 extern const void *of_device_get_match_data(const struct device *dev);
 
 extern ssize_t of_device_modalias(struct device *dev, char *str, ssize_t len);

include/linux/of_platform.h

@@ -52,6 +52,11 @@ extern const struct of_device_id of_default_bus_match_table[];
 extern struct platform_device *of_device_alloc(struct device_node *np,
 					 const char *bus_id,
 					 struct device *parent);
+
+extern int of_device_add(struct platform_device *pdev);
+extern int of_device_register(struct platform_device *ofdev);
+extern void of_device_unregister(struct platform_device *ofdev);
+
 #ifdef CONFIG_OF
 extern struct platform_device *of_find_device_by_node(struct device_node *np);
 #else