dt-bindings: dmaengine: Add X1000 bindings.

Add the dmaengine bindings for the X1000 Soc from Ingenic.

Signed-off-by: Zhou Yanjie <zhouyanjie@zoho.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1571937670-30828-2-git-send-email-zhouyanjie@zoho.com


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