no audio for Android cause of Failed to create a new AudioRecord instance

[ynheng]

E/AudioRecord: AudioFlinger could not create record track, status: -1
E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -1.
E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.
Init recording error: Failed to create a new AudioRecord instance -> WebRtcAudioRecord