ASoC: qi_lb60: Set .dai_fmt instead of calling snd_soc_set_dai_fmt()

Rather than calling snd_soc_set_dai_fmt(), just set the dai_fmt field in the
dai_link struct. Both have the same effect, but the later is a bit shorter and
also allows us to remove the now unused init callback.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>