dt-bindings: arm: renesas: Document Renesas RZ/V2M SoC and EVK board

dt-bindings: arm: renesas: Document Renesas RZ/V2M SoC and EVK board

Details of the SoC can be found here:
https://www.renesas.com/us/en/products/microcontrollers-microprocessors/rz-cortex-a-mpus/rzv2m-dual-cortex-a53-lpddr4x32bit-ai-accelerator-isp-4k-video-codec-4k-camera-input-fhd-display-output

The RZ/V2M Evaluation Kit (V2MEVK) consists of the RZ/V2M Main Board,
RZ/V2M Base Board, and CIS IMX415 Board (CIS).

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20220330154024.112270-2-phil.edworthy@renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>