Our contacts at Conexant suggested that we reduce the external
microphone bias to 50% in order to center the input signal with
the DC input range of the codec. This is because the microphone
port is DC coupled for potential use with sensors.
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>