User proper volume curve for AUDIO_STREAM_VOICE_CALL over Hearing Aids

AUDIO_STREAM_VOICE_CALL should never mute.

Test: lower the volume during voice call while using Hearing Aid
Bug: 137344679
Change-Id: I882746d38f37433ad617402b43d827762637a36c
diff --git a/audio_policy_volumes_b1.xml b/audio_policy_volumes_b1.xml
index 42e1d6a..32f3419 100644
--- a/audio_policy_volumes_b1.xml
+++ b/audio_policy_volumes_b1.xml
@@ -44,7 +44,7 @@
     <volume stream="AUDIO_STREAM_VOICE_CALL" deviceCategory="DEVICE_CATEGORY_EXT_MEDIA"
                                              ref="DEFAULT_MEDIA_VOLUME_CURVE"/>
     <volume stream="AUDIO_STREAM_VOICE_CALL" deviceCategory="DEVICE_CATEGORY_HEARING_AID"
-                                             ref="DEFAULT_HEARING_AID_VOLUME_CURVE"/>
+                                             ref="DEFAULT_NON_MUTABLE_HEARING_AID_VOLUME_CURVE"/>
     <volume stream="AUDIO_STREAM_SYSTEM" deviceCategory="DEVICE_CATEGORY_HEADSET">
         <point>1,-3000</point>
         <point>33,-2600</point>
diff --git a/audio_policy_volumes_c1.xml b/audio_policy_volumes_c1.xml
index f2a4eab..c25b1dc 100644
--- a/audio_policy_volumes_c1.xml
+++ b/audio_policy_volumes_c1.xml
@@ -44,7 +44,7 @@
     <volume stream="AUDIO_STREAM_VOICE_CALL" deviceCategory="DEVICE_CATEGORY_EXT_MEDIA"
                                              ref="DEFAULT_MEDIA_VOLUME_CURVE"/>
     <volume stream="AUDIO_STREAM_VOICE_CALL" deviceCategory="DEVICE_CATEGORY_HEARING_AID"
-                                             ref="DEFAULT_HEARING_AID_VOLUME_CURVE"/>
+                                             ref="DEFAULT_NON_MUTABLE_HEARING_AID_VOLUME_CURVE"/>
     <volume stream="AUDIO_STREAM_SYSTEM" deviceCategory="DEVICE_CATEGORY_HEADSET">
         <point>1,-3000</point>
         <point>33,-2600</point>