ZTE Axon 7
stock (ships with 6.0.x)
AKM 4961 HiFi Recording Processor+ AKM 4490 HiFi Audio Amplifier chips included for hi-res audio
/etc/audio_policy.conf included from the Chinese B05 ROM. The US/international versions should have the same chipset.
audio_policy.conf
Edit: just for note, with an actual US release phone in hand, it has the option for hi res audio for the internal Snapdragon 24-bit PCM, but not the special DAC chips in the phone.