Enable Headset Button for ThinkPad X1

[Takashi Iwai]

On Thu, 20 Feb 2020 09:42:21 +0100,
Kailang wrote:
> 
> Hi Takashi,
> 
> Lenovo ThinkPad X1 want to support Headset Button.
> Attach patch will enable it.

Applied, thanks.


Takashi