ASoC: rsnd: fallback to PIO mode if DMA mode was failed

ASoC: rsnd: fallback to PIO mode if DMA mode was failed

Current Renesas R-Car sound driver probe will be failed
if it try to use DMA mode and it couldn't use for some reasons.
But PIO mode works even though in such case.
This patch try to fallback to PIO mode if DMA mode probing was failed.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit d3a768233243b5892a9c74b85896b9e8c017b259)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>