ASoC: bdw-rt5677: Add a DAI link for rt5677 SPI PCM device

This link is needed for the RT5677 DSP to do hotwording

Signed-off-by: Ben Zhang <benzh@chromium.org>
Signed-off-by: Curtis Malainey <cujomalainey@chromium.org>
Link: https://lore.kernel.org/r/20191106011335.223061-3-cujomalainey@chromium.org


Signed-off-by: Mark Brown <broonie@kernel.org>