can: rcar_canfd: Update bit rate constants for RZ/G3E and R-Car Gen4

can: rcar_canfd: Update bit rate constants for RZ/G3E and R-Car Gen4

The calculation formula for nominal bit rate of classical CAN is the same as
that of nominal bit rate of CANFD on the RZ/G3E and R-Car Gen4 SoCs
compared to other SoCs. Update nominal bit rate constants.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20250908120940.147196-2-biju.das.jz@bp.renesas.com
[mkl: slightly improve wording of commit message]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>