MLK-17285 dma: imx-sdma: fix sound mute in high loading

MLK-17285 dma: imx-sdma: fix sound mute in high loading

SDMA channel will stop in case of cpu high loading. That caused by
sdma ISR can't be handled in time while all cyclic bds consumed by
sdma side, then sdma channel stopped. Re-enable channel in this case
to workaound the issue.

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Reviewed-by: Shengjiu Wang <shengjiu.wang@nxp.com>
(cherry picked from commit 98c43d24d19d28ae364e7fedf48d61e98a2ec9e4)
(cherry picked from commit 65f426ddd092175602993cf4494e75f84f50b58a)