Xperia X Performance (Using build 704 downloaded from the forum)
Rom: Stock (41.2.A.7.65) 7.1.1
Uploaded the new xml format of audio_policy
Thanks
audio_policy_configuration.xml
EDIT: It works like a charm now (24 bit 96khz). I just copied audio_policy.conf from Z2 (lollipop) to my device and rebooted.
From this page: https://source.android.com/devices/audio/implement-policy.
It will use .conf format by default. I also attached one from Z2.
audio_policy.conf