dt-bindings: gpu: samsung: re-order entries to match coding convention

The Devicetree bindings coding convention, as used in most of the files
and expressed in Documentation/devicetree/bindings/example-schema.yaml,
expects "allOf:" block with if-statements after "required:" block.

Re-order few schemas to match the convention to avoid repeating review
comments for new patches using existing code as template.  No functional
changes.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20231112184403.3449-2-krzysztof.kozlowski@linaro.org


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