dt-bindings: renesas: Document preferred compatible naming

Compatibles can come in two formats. Either "vendor,ip-soc" or
"vendor,soc-ip". Add a DT schema file documenting Renesas preferred
policy and enforcing it for all new compatibles, except few existing
patterns.

Suggested-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Niklas Söderlund <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Geert Uytterhoeven <[email protected]>

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