dt-bindings: memory: renesas,rpc-if: Document RZ/V2L SoC

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

While at it, drop the comment "# RZ/G2L family" for "renesas,rzg2l-rpc-if"
compatible string as this will avoid changing the line for every new SoC
addition.

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>
Link: https://lore.kernel.org/r/20220301123527.15950-1-prabhakar.mahadev-lad.rj@bp.renesas.com


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>