dt-bindings: soc: renesas: Add various SolidRun RZ/G2 based boards

Add bindings for various SolidRun boards and System on Modules built
around the Renesas RZ/G2 family of SoCs:
  - RZ/G2L SoM [1]
  - RZ/V2L SoM [2]
    (shares PCB with G2L and has very similar programming model)
  - RZ/G2LC SoM [3]
  - RZ/G2UL SoM [4]
    (shares PCB with G2LC but programming model differs largely)
  - HummingBoard IIoT [5] (RZ/G2L, RZ/V2L, RZ/G2LC)
  - HummingBoard Pro [6] (RZ/G2L, RZ/V2L)
  - HummingBoard Base (Ripple) [7] (RZ/G2L, RZ/V2L, RZ/G2LC, RZ/G2UL)

[1] https://www.solid-run.com/embedded-industrial-iot/renesas-rz-family/rz-g2l-som/
[2] https://www.solid-run.com/embedded-industrial-iot/renesas-rz-family/rz-v2l-som/
[3] https://www.solid-run.com/embedded-industrial-iot/renesas-rz-family/rz-g2lc-som/
[4] https://www.solid-run.com/embedded-industrial-iot/renesas-rz-family/rz-g2ul-som/
[5] https://www.solid-run.com/embedded-industrial-iot/renesas-rz-family/hummingboard-rz-series-sbcs/hummingboard-rz-g2l-iot-sbc/
[6] https://www.solid-run.com/embedded-industrial-iot/renesas-rz-family/hummingboard-rz-series-sbcs/hummingboard-rz-g2l-sbc/
[7] https://www.solid-run.com/embedded-industrial-iot/renesas-rz-family/hummingboard-rz-series-sbcs/hummingboard-rz-g2lc-base/

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Josua Mayer <josua@solid-run.com>
Link: https://patch.msgid.link/20260928-rzg2-sr-boards-v10-1-91752ea39cbc@solid-run.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

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