dt-bindings: dma: snps,dma-spear1340: Fix data{-,_}width schema

dt-bindings: dma: snps,dma-spear1340: Fix data{-,_}width schema

'data-width' and 'data_width' properties are defined as arrays, but the
schema is defined as a matrix. That works currently since everything gets
decoded in to matrices, but that is internal to dtschema and could change.

Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240401204354.1691845-1-robh@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>