dt-bindings: dma: cleanup examples - indentation, lowercase hex

Cleanup examples:
 - use 4-space indentation (for cases when it is neither 4 not 2 space),
 - use lowercase hex,
 - drop unused node's label.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230124081117.31186-2-krzysztof.kozlowski@linaro.org


Signed-off-by: Vinod Koul <vkoul@kernel.org>