Codec AK4961 can not affect the DAC AK4490. Never and never, under any conditions. It only works for conversations, speakers and mic. only. The DSP function makes the SD820, more precisely the Hexagon DSP core.
It's not very difficult to see datasheets, is not it?
Axon 7 is equipped with headphones amplifiers TI OPA1612, again codec does not participate.