Merge branch 'preparation-for-supporting-esd-CAN-USB-3'

Frank Jungclaus says:
====================
All following 5 patches must be seen as preparation for adding support
of the newly available esd CAN-USB/3 to esd_usb2.c.

After having gained some confidence and experience on sending patches
to [email protected], I'll again submit the code changes for
CAN-USB/3 support as step #2.
====================

Link: https://lore.kernel.org/all/[email protected]
Signed-off-by: Marc Kleine-Budde <[email protected]>