dt-bindings: dma: sun50i-a64: Add compatible for D1

D1 has a DMA controller similar to the one in other Allwinner SoCs.
Add its compatible, and include it in the list of variants with a
separate MBUS clock gate.

Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Maxime Ripard <maxime@cerno.tech>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Link: https://lore.kernel.org/r/20220424172759.33383-2-samuel@sholland.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>