dt-bindings: net: can: renesas,rcar-canfd: Document RZ/V2L SoC

Document RZ/V2L CANFD bindings. RZ/V2L CANFD is identical to one found on
the RZ/G2L SoC. No driver changes are required as generic compatible
string "renesas,rzg2l-canfd" will be used as a fallback.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220227213250.23637-1-prabhakar.mahadev-lad.rj@bp.renesas.com