ASoC: meson: axg-card: add toacodec support

Make sure the axg audio card driver recognise the dai_link as a
codec-to-codec link if the cpu dai is the internal dac glue.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20200221153607.1585499-4-jbrunet@baylibre.com


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