dt-bindings: soc: renesas: Document SMARC Carrier-II EVK

dt-bindings: soc: renesas: Document SMARC Carrier-II EVK

Document the Renesas SMARC Carrier-II EVK board which is based on the
Renesas RZ/G3S SMARC SoM.  The SMARC Carrier-II EVK consists of an
RZ/G3S SoM module and a SMARC Carrier-II carrier board; the SoM module
sits on top of the carrier board.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230929053915.1530607-27-claudiu.beznea@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>