Default Device maintainer I need help with ""

I was hoping a device maintainer can help add audio.r_submix.default to the product_packages in the file for p-3110. I'm trying to get #mirrorenabler to work so I could mirror my screen to my chromecast. This is thread on #mirrorenabler says you would know about the Default.

Here's the link on xda -

Thanks for any and all help