can: kvaser_usb: Add USB_{LEAF,HYDRA}_PRODUCT_ID_END defines

Add USB_{LEAF,HYDRA}_PRODUCT_ID_END defines, representing the last USB PID
entry in respectively family. This removes the need to update the
kvaser_is_{leaf,hydra}() functions whenever new devices are added.

Signed-off-by: Jimmy Assarsson <extja@kvaser.com>
Link: https://lore.kernel.org/r/20201115163027.16851-3-jimmyassarsson@gmail.com


Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>