rcar_canfd_channel_probe() and rcar_canfd_probe() have many users of
"pdev->dev".  Introduce shorthands to simplify the code.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/all/2965edc7992ab54dc6c862910775f3466fca6b29.1674499048.git.geert+renesas@glider.beSigned-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>