MLK-25465-6 dmaengine: imx-sdma: fix the long dma transfer timing grater than 2s

MLK-25465-6 dmaengine: imx-sdma: fix the long dma transfer timing grater than 2s

In case the dma transfer timing longer than 2s, sdma would be power
off so that cyclic transfer would be broken, forbid runtime auto suspend
in such case instead.

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Reviewed-by: Shengjiu Wang <shengjiu.wang@nxp.com>
(cherry picked from commit 9df533ad0ab7767db7cff1293d0c8dafb599130b)