ASoC: amd: Use single dai for da7219 playback and capture

BT I2S is a bi-directional dai, we will use the same
cpu dai for playback and capture.

TEST=aplay -D hw:0,0 -vv <file>
arecord -D hw:0,0 -f dat -d 5 -vv <file>

Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com>
Signed-off-by: Mark Brown <broonie@kernel.org>