arm64: dts: renesas: rzg3s-smarc: Add gpio keys

RZ SMARC Carrier II board has 3 user buttons called USER_SW1, USER_SW2,
USER_SW3. Add a DT node in device tree to propertly instantiate the
gpio-keys driver for these buttons.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20231227130810.2744550-1-claudiu.beznea.uj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arm64: dts: renesas: rzg3s-smarc: Enable SDHI1

Add SDHI1 to RZ/G3S Smarc Carrier-II board. This is connected to a uSD
interface. Although Vccq doesn't cross the boundary of SoM it has
been added to RZ/G3S Smarc Carrier-II dtsi to have all the bits related to
SDHI1 in a single place. At the moment SoM is used only with RZ/G3S Smarc
Carrier-II board.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20231016105344.294096-3-claudiu.beznea.uj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arm64: dts: renesas: Add initial device tree for RZ SMARC Carrier-II Board

Add the initial device tree for the RZ SMARC Carrier-II. At the moment
it contains only the serial interface.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230929053915.1530607-26-claudiu.beznea@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>