dmaengine: ti: k3-udma: Do not initialize ret in tisci channel config functions

The ret does not need to be initialized to 0 in the tisci channel config
functions.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Link: https://lore.kernel.org/r/20210113114923.9231-4-peter.ujfalusi@gmail.com


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