ASoC: rsnd: tidyup DMA start/stop timing on SSI

Current DMA starts after SSI, and stops before SSI. but we need
to reverse these order. Otherwise, under/over run error might happen.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>