Hi Jiang,
I had the same build error in android-10.0.0_29 about *#error Audio policy 
no longer supports legacy .conf configuration format* and found your post 
by searching the error on Google. I finally worked around the issue thanks 
to this link https://source.android.com/devices/audio/implement-policy
Into the device's associated "BoardConfig.mk" I added 
USE_XML_AUDIO_POLICY_CONF := 1 and the problem disappeared
This may be not interesting for you anymore, but I'm putting the solution 
here, just in case anyone is encountering the same issue and looks here as 
I did.

Bye

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