configs: enables backward compatibility for legacy volume APIs

Enables backward compatibility for the legacy volume
APIs based on stream types by setting the config_useFixedVolume
value to false in config.xml file of framework for overlay.

Change-Id: Ia5fbe62c32e3689a85028949b864be2d9a34bc79
diff --git a/configs/msmnile_au/overlay/frameworks/base/core/res/res/values/config.xml b/configs/msmnile_au/overlay/frameworks/base/core/res/res/values/config.xml
index 01e279d..0274f9e 100644
--- a/configs/msmnile_au/overlay/frameworks/base/core/res/res/values/config.xml
+++ b/configs/msmnile_au/overlay/frameworks/base/core/res/res/values/config.xml
@@ -23,7 +23,7 @@
 
 <resources>
      <!-- Car uses hardware amplifier for volume. -->
-    <bool name="config_useFixedVolume">true</bool>
+    <bool name="config_useFixedVolume">false</bool>
     <!--
       Handle volume keys directly in CarAudioService without passing them to the foreground app
     -->