MLK-19451: dmaengine: imx-sdma: remove mdelay(1)

commit 7f3ff14b ("dmaengine: imx-sdma: add 1ms delay to ensure
SDMA channel is stopped") add 1ms delay to ensure no dma done interrupt
come in after channel disabled. This 1ms may cause SAI underrun issue
between two times playback, because ALSA framework stop SAI module after
dma terminate, thus the 1ms timing window trigger continuous 'underrun'
interrupt. Actually, don't need 1ms delay anymore since virt-dma could
handle the interrupt after channel terminated.

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Reviewed-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>
Signed-off-by: Srikanth Krishnakar <Srikanth_Krishnakar@mentor.com>