dt-bindings: dma: adi,axi-dmac: convert to yaml schema

Convert the AXI DMAC bindings from .txt to .yaml.

Acked-by: Nuno Sa <nuno.sa@analog.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://lore.kernel.org/r/20241216-axi-dma-dt-yaml-v3-1-7b994710c43f@baylibre.com


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