dt-bindings: dma-controller: Split interrupt fields in example

Best practice for multi-cell property values is to bracket each multi-cell
value.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220106182518.1435497-2-robh@kernel.org


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