dt-bindings: dma: convert arm-pl08x to yaml

Converts dma/arm-pl08x.txt to yaml.
In the process, I add an example for the faraday variant.

Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210430183651.919317-1-clabbe@baylibre.com


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