HID: logitech: allow the DJ device to request the unifying name

HID: logitech: allow the DJ device to request the unifying name

The names of the DJ devices are stored in the receiver. These names
can be retrieved through a HID++ command. However, the protocol says
that you have to ask the receiver for that, not the device iteself.

Introduce a special case in the DJ handling where a device can request
its unifying name, and when such a name is given, forward it also to
the corresponding device.

On the HID++ side, the receiver talks only HID++ 1.0, so we need to
implement this part of the protocol in the module.

Signed-off-by: Benjamin Tissoires <[email protected]>
Tested-by: Andrew de los Reyes <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>