dt-bindings: dma: fsl-edma: add new fsl,fsl,ls1028a-edma

QORIQ LS1028A soc used fsl,vf610-edma, but it has a little bit different
from others, so add new compatible to distinguish them.

Signed-off-by: Peng Ma <peng.ma@nxp.com>
Link: https://lore.kernel.org/r/20191212033714.4090-3-peng.ma@nxp.com


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