can: rcar_canfd: Drop unused macros

Drop unused macros from the rcar_canfd.c.

Reported-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Closes: https://lore.kernel.org/all/7ff93ff9-f578-4be2-bdc6-5b09eab64fe6@wanadoo.fr/


Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://patch.msgid.link/20250702120539.98490-1-biju.das.jz@bp.renesas.com


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