can: rcar_canfd: Drop the mask operation in RCANFD_GAFLCFG_SETRNC macro

Drop the mask operation in RCANFD_GAFLCFG_SETRNC macro as the num_rules
can never be larger than number of supported rules.

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://patch.msgid.link/20250417054320.14100-7-biju.das.jz@bp.renesas.com


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