ASoC: tlv320aic3x: Add virtual output pin Detection

Purpose of this virtual Detection pin is to keep codec bias on whenever the
GPIO or jack detection features are needed.

Jack detection needs a mic bias so machine drivers can construct a following
route for instance for keeping the path and codec bias on:

"Input Jack" -> "Mic Bias xV" -> "Detection" -> detection block inside codec.

For the GPIO the machine driver can force the pin on with
snd_soc_dapm_force_enable_pin.

Signed-off-by: Jarkko Nikula <[email protected]>
Acked-by: Mark Brown <[email protected]>
Signed-off-by: Liam Girdwood <[email protected]>

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