Revert "of: base: add support to get machine model name"

This reverts commit e5269794d2e9046dd45be15bdb213a229df46b7e.

drivers/of/base.c

···
 EXPORT_SYMBOL(of_machine_is_compatible);
 
 /**
- * of_machine_get_model_name - Find and read the model name or the compatible
- *		value for the machine.
- * @model:	pointer to null terminated return string, modified only if
- *		return value is 0.
- *
- * Returns a string containing either the model name or the compatible value
- * of the machine if found, else return error.
- *
- * Search for a machine model name or the compatible if model name is missing
- * in a device tree node and retrieve a null terminated string value (pointer
- * to data, not a copy). Returns 0 on success, -EINVAL if root of the device
- * tree is not found and other error returned by of_property_read_string on
- * failure.
- */
-int of_machine_get_model_name(const char **model)
-{
-	int error;
-
-	if (!of_node_get(of_root))
-		return -EINVAL;
-
-	error = of_property_read_string(of_root, "model", model);
-	if (error)
-		error = of_property_read_string_index(of_root, "compatible",
-						      0, model);
-	of_node_put(of_root);
-
-	return error;
-}
-EXPORT_SYMBOL(of_machine_get_model_name);
-
-/**
  *  __of_device_is_available - check if a device is available for use
  *
  *  @device: Node to check for availability, with locks already held

include/linux/of.h

···
 extern int of_alias_get_highest_id(const char *stem);
 
 extern int of_machine_is_compatible(const char *compat);
-extern int of_machine_get_model_name(const char **model);
 
 extern int of_add_property(struct device_node *np, struct property *prop);
 extern int of_remove_property(struct device_node *np, struct property *prop);
···
 static inline int of_machine_is_compatible(const char *compat)
 {
 	return 0;
-}
-
-static inline int of_machine_get_model_name(const char **model)
-{
-	return -EINVAL;
 }
 
 static inline bool of_console_check(const struct device_node *dn, const char *name, int index)