ASoC: rsnd: add SNDRV_PCM_TRIGGER_SUSPEND/RESUME

This patch adds SNDRV_PCM_TRIGGER_SUSPEND/RESUME.
Otherwise, it breaks rsnd driver internal start/stop counter
when suspend/resume. This issue was reported/tested by Hiep

Tested-by: Hiep Cao Minh <cm-hiep@jinso.co.jp>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>