ASoC: rsnd: enable module multi connection

'8a4e379b("ASoC: rsnd: remove io from rsnd_mod")' removed mod/io
relationship. rsnd_dai_connect() mod/io check is no longer needed

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Keita Kobayashi <keita.kobayashi.ym@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>