can: kvaser_pciefd: Add function to set skb hwtstamps

Add new function, kvaser_pciefd_set_skb_timestamp(), to set skb hwtstamps.

Signed-off-by: Jimmy Assarsson <extja@kvaser.com>
Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://lore.kernel.org/all/20230529134248.752036-4-extja@kvaser.com


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