ASoC: qi_lb60: Set fully_routed flag

The routes for this sound card are fully specified, so set the fully_routed
flag. This allows us to remove the manual snd_soc_dapm_nc_pin() calls.

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