dt-bindings: mmp-dma: convert to YAML

Convert the Marvell MMP DMA binding to YAML.

The TXT binding mentions that the controller may have one IRQ per DMA
channel. Examples of this were dropped in the YAML binding because of
dt_binding_check complaints (either too many interrupt cells or
interrupts) and the fact that this is not used in any of the in-tree
device trees.

Signed-off-by: Duje Mihanović <duje.mihanovic@skole.hr>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20240131-pxa-dma-yaml-v2-2-9611d0af0edc@skole.hr
Signed-off-by: Vinod Koul <vkoul@kernel.org>