A fututure patch will need to use the array of magic data that the
UGEEv2 devices expect on probe and the endpoint number. Move them to a
common place.

Refactor, no functional changes.
Tested-by: Mia Kanashi <chad@redpilled.dev>
Tested-by: Andreas Grosse <andig.mail@t-online.de>
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>