Adjust headset mic audio settings

 - Increase headset_input parameter IN1L Volume to 28 in audio_hw.h to increase microphone gain

Change-Id: I1e45d03709f2fc650befca410f47f9a44340c41b
diff --git a/audio/audio_hw.h b/audio/audio_hw.h
index a9ce435..32db220 100644
--- a/audio/audio_hw.h
+++ b/audio/audio_hw.h
@@ -225,7 +225,7 @@
     { .ctl_name = "MIXINL IN2L Switch", .intval = 0, },
     { .ctl_name = "MIXINR IN1R Switch", .intval = 0, },
     { .ctl_name = "Headset Mic Switch", .intval = 1, },
-    { .ctl_name = "IN1L Volume", .intval = 18, },
+    { .ctl_name = "IN1L Volume", .intval = 28, },
     { .ctl_name = "MIXINL IN1L Switch", .intval = 1, },
     { .ctl_name = "MIXINL IN1L Volume", .intval = 0, },
     { .ctl_name = "AIF1ADC1 HPF Mode", .intval = 1, },