dt-bindings: arm: renesas: Document Renesas RZ/V2L SoC on SMARC EVK

Document the Renesas SMARC EVK board which is based on the Renesas
RZ/V2L (R9A07G054) SoC.  The SMARC EVK consists of an RZ/V2L SoM module
and a SMARC carrier board.  The SoM module sits on top of the carrier
board.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211221094717.16187-2-prabhakar.mahadev-lad.rj@bp.renesas.com
Link: https://lore.kernel.org/r/20211221094717.16187-3-prabhakar.mahadev-lad.rj@bp.renesas.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>