arm64: dts: renesas: rzg3s-smarc-som: Enable eMMC by default

arm64: dts: renesas: rzg3s-smarc-som: Enable eMMC by default

Enable eMMC by default on the RZ/G3S SMARC platform, as previously done
on RZ/G2L boards and other Renesas platforms.

The SW_CONFIG2 setting selects between the uSD0 card and eMMC. By setting
SW_CONFIG2 to SW_OFF, we select eMMC by default.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20240417112003.428348-1-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>