Converts the device tree bindings for the Actions Semi Owl SoCs DMA
Controller over to YAML schemas.

It also adds new compatible string "actions,s700-dma".
Signed-off-by: Amit Singh Tomar <amittomer25@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1595180527-11320-2-git-send-email-amittomer25@gmail.comSigned-off-by: Vinod Koul <vkoul@kernel.org>