ASoC: twl6040: Convert to use DAI DAPM widgets

Use DAPM mapping for stream events and give unique names for the streams.
This change also fixes the following warning:
twl6040-codec twl6040-codec: Failed to create Capture debugfs file

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>