driver core: bus: move documentation for lock_key to proper location.

In commit 37e98d9b ("driver core: bus: move lock_class_key into
dynamic structure"), the lock_key variable moved out of struct bus_type
and into struct subsys_private, yet the documentation for it did not
move.  Fix that up and place the documentation comment in the correct
location.

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Fixes: 37e98d9b ("driver core: bus: move lock_class_key into dynamic structure")
Link: https://lore.kernel.org/r/20230324090814.386654-1-gregkh@linuxfoundation.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/base.h

@@ -33,6 +33,7 @@
  *              avoid namespace conflicts
  * @class - pointer back to the struct class that this structure is associated
  *          with.
+ * @lock_key:	Lock class key for use by the lock validator
  *
  * This structure is the one that is the actual kobject allowing struct
  * bus_type/class to be statically allocated safely.  Nothing outside of the

include/linux/device/bus.h

@@ -65,7 +65,6 @@ struct fwnode_handle;
  * @iommu_ops:  IOMMU specific operations for this bus, used to attach IOMMU
  *              driver implementations to a bus and allow the driver to do
  *              bus-specific setup
- * @lock_key:	Lock class key for use by the lock validator
  * @need_parent_lock:	When probing or removing a device on this bus, the
  *			device core should lock the device's parent.
  *