driver core: Rename declaration parameter name for API device_find_child() cluster

For APIs:
device_find_child()
device_for_each_child()
device_for_each_child_reverse()

Their declaration has parameter name 'dev', but their defination
changes the name to 'parent'.

Rename declaration name to defination 'parent' to make both have
the same name.

Reviewed-by: Fan Ni <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Signed-off-by: Zijun Hu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: zijun-hu

include/linux/device.h

@@ -1074,14 +1074,14 @@ void device_del(struct device *dev);
 
 DEFINE_FREE(device_del, struct device *, if (_T) device_del(_T))
 
-int device_for_each_child(struct device *dev, void *data,
+int device_for_each_child(struct device *parent, void *data,
 			  int (*fn)(struct device *dev, void *data));
-int device_for_each_child_reverse(struct device *dev, void *data,
+int device_for_each_child_reverse(struct device *parent, void *data,
 				  int (*fn)(struct device *dev, void *data));
 int device_for_each_child_reverse_from(struct device *parent,
 				       struct device *from, const void *data,
 				       int (*fn)(struct device *, const void *));
-struct device *device_find_child(struct device *dev, const void *data,
+struct device *device_find_child(struct device *parent, const void *data,
 				 device_match_t match);
 struct device *device_find_child_by_name(struct device *parent,
 					 const char *name);