dmaengine: ti: k3-udma: Use correct node to read "ti,udma-atype"

The "ti,udma-atype" property is expected in the UDMA node and not in the
parent navss node.

Fixes: 0ebcf1a2 ("dmaengine: ti: k3-udma: Implement support for atype (for virtualization)")
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20200527065357.30791-1-peter.ujfalusi@ti.com


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