dt-bindings: serial: renesas,scif: document r9a08g045 support

Document support for the Serial Communication Interface with FIFO (SCIF)
available in the Renesas RZ/G3S (R9A08G045) SoC. SCIF interface in
Renesas RZ/G3S is similar to the one available in RZ/G2L.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20231006103959.197485-2-claudiu.beznea.uj@bp.renesas.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>