Revert "driver core: create a private portion of struct device"

This reverts commit 2831fe6f9c.

Turns out that device_initialize shouldn't fail silently.
This series needs to be reworked in order to get into proper
shape.

Reported-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/base/base.h

@@ -63,18 +63,6 @@ struct class_private {
 #define to_class(obj)	\
 	container_of(obj, struct class_private, class_subsys.kobj)
 
-/**
- * struct device_private - structure to hold the private to the driver core portions of the device structure.
- *
- * @device - pointer back to the struct class that this structure is
- * associated with.
- *
- * Nothing outside of the driver core should ever touch these fields.
- */
-struct device_private {
-	struct device *device;
-};
-
 /* initialisation functions */
 extern int devices_init(void);
 extern int buses_init(void);