Change headset mic gain for voice call

Decrease headset mic gain by 8dB for
voice call

Bug: 11660005
Change-Id: I7c3545e21c4de5af3b32454a7228dad223f026e5
diff --git a/mixer_paths.xml b/mixer_paths.xml
index dde6b81..49be2d5 100644
--- a/mixer_paths.xml
+++ b/mixer_paths.xml
@@ -319,8 +319,8 @@
 
     <path name="voice-headset-mic">
         <path name="adc2" />
-        <ctl name="ADC2 Volume" value="17" />
-        <ctl name="DEC5 Volume" value="96" />
+        <ctl name="ADC2 Volume" value="15" />
+        <ctl name="DEC5 Volume" value="91" />
     </path>
 
     <path name="speaker-and-headphones">