dt-bindings: clock: renesas,r9a06g032-sysctrl: Convert to json-schema

Convert the Renesas RZ/N1D (R9A06G032) System Controller (SYSCTRL)
Device Tree binding documentation to json-schema.

Drop the consumer example, as it doesn't belong here.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/24d1bd7c4c46747f4e2828974c2e2e48e778bff8.1620119439.git.geert+renesas@glider.be


Signed-off-by: Rob Herring <robh@kernel.org>