dt-bindings: dma: Convert fsl,elo*-dma to YAML

The devicetree bindings for Freescale DMA engines have so far existed as
a text file. This patch converts them to YAML, and specifies all the
compatible strings currently in use in arch/powerpc/boot/dts.

Signed-off-by: J. Neuschäfer <j.ne@posteo.net>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250308-ppcyaml-dma-v4-1-20392ea81ec6@posteo.net


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