arm64: dts: renesas: Add support for solidrun rzv2l som and hb-iiot evb

Add support for the SolidRun RZ/V2L [1] SoM on HummingBoard IIoT [2].

The SoM features:
  - 2x 1Gbps Ethernet with PHY
  - eMMC
  - 1/2GB DDR
  - WiFi + Bluetooth
  - SDHI Mux switching between eMMC and Carrier Board

The HummingBoard IIoT features:
  - 3x USB-2.0 Type A connector
  - 2x 1Gbps RJ45 Ethernet
  - USB Type-C Console Port
  - microSD connector
  - RTC with backup battery
  - RGB Status LED
  - 1x M.2 B-Key connector with USB-2.0 + SIM card holder
  - 1x DSI Display Connector
  - GPIO header
  - 2x RS232/RS485 ports (configurable)
  - 2x CAN

The RZ/V2L SoM shares PCB with RZ/G2L, differing only in the SoC itself.
RZ/V2L is adding a powerful DRP-AI NPU which G2L lacks.

Due to the similarities most code is shared, including DT overlays for
eMMC, microSD, and RS485.

[1] https://www.solid-run.com/embedded-industrial-iot/renesas-rz-family/rz-v2l-som/
[2] https://www.solid-run.com/embedded-industrial-iot/renesas-rz-family/hummingboard-rz-series-sbcs/hummingboard-rz-g2l-iot-sbc/

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-v10-5-91752ea39cbc@solid-run.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

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