[alsa-devel] Add headset support for Dell laptop

[Kailang]

Hi Takashi,

Attach patch was for support headset mode for Dell laptop.

This platform had two Dmic and single Dmic.
This update was for single Dmic.

This commit was for two Dmic. 
commit	75ee94b20b46459e3d29f5ac2c3af3cebdeef777

Many thanks.

BR,
Kailang
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