Add dedicated helpers for codec and codec_dai search in preparation
for DAI-multicodec. It will help reducing the extra indentation
that will be introduced by the iteration over multiple codecs.

Previous implementation unnecessarily kept searching for a matching
codec in the remaining register codecs even if it was already found.

Fix that by returning in case of matching.
Signed-off-by: NMisael Lopez Cruz <misael.lopez@ti.com>
[fparent@baylibre.com: Adapt to 3.14+]
Signed-off-by: NFabien Parent <fparent@baylibre.com>
Signed-off-by: NBenoit Cousson <bcousson@baylibre.com>
Signed-off-by: NMark Brown <broonie@linaro.org>