can: rcar_canfd: Use devm_reset_control_get_optional_exclusive

Replace devm_reset_control_get_exclusive->devm_reset_control_
get_optional_exclusive so that we can avoid unnecessary
SoC specific check in probe().

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/all/20221025155657.1426948-4-biju.das.jz@bp.renesas.com


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