ASoC: pcm: Add support for DAI multicodec

Add multicodec support in soc-pcm.c
Signed-off-by: NBenoit Cousson <bcousson@baylibre.com>
Signed-off-by: NMisael Lopez Cruz <misael.lopez@ti.com>
Signed-off-by: NFabien Parent <fparent@baylibre.com>
Tested-by: NLars-Peter Clausen <lars@metafoo.de>
Reviewed-by: NLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NMark Brown <broonie@linaro.org>