dt-bindings: clock: renesas,rzg2l: Document RZ/V2M SoC

Document the device tree binding for the Renesas RZ/V2M (r9a09g011) SoC.

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/20220503115557.53370-4-phil.edworthy@renesas.com


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