can: peak_usb: add callback to read CAN channel ID of PEAK CAN-FD devices

can: peak_usb: add callback to read CAN channel ID of PEAK CAN-FD devices

This patch adds a new function that allows to read the CAN channel ID
from the non volatile memory of the USB CAN-FD PEAK devices. The CAN
channel ID is a user-configurable u8/u32 identifier value that can be set
individually for each PEAK CAN interface.

Signed-off-by: Stephane Grosjean <s.grosjean@peak-system.com>
Signed-off-by: Lukas Magel <lukas.magel@posteo.net>
Link: https://lore.kernel.org/all/20230116200932.157769-3-lukas.magel@posteo.net
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>