can: kvaser_usb: leaf: Store MSB of timestamp

Store MSB of timestamp, provided from the device via the clock overflow
event, for usbcan devices (M16C).

Signed-off-by: Jimmy Assarsson <extja@kvaser.com>
Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://lore.kernel.org/all/20240701154936.92633-12-extja@kvaser.com


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