driver core: device.h: fix Excess kernel-doc description warning

Remove the @knode_class: line to prevent the kernel-doc warning:

include/linux/device.h:807: warning: Excess struct member 'knode_class' description in 'device'

Signed-off-by: Randy Dunlap <[e-mail]>
Cc: Greg Kroah-Hartman <[e-mail]>
Cc: "Rafael J. Wysocki" <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

include/linux/device.h

···
  * @id:		device instance
  * @devres_lock: Spinlock to protect the resource of the device.
  * @devres_head: The resources list of the device.
- * @knode_class: The node used to add the device to the class list.
  * @class:	The class of the device.
  * @groups:	Optional attribute groups.
  * @release:	Callback to free the device after all references have