Android 8.1 音量调节去掉铃声和闹钟，默认调节媒体音量

惯例，直接上代码

iff --git a/frameworks/base/core/res/res/values/config.xml b/frameworks/base/core/res/res/values/config.xml
index 873a95b381..7604b3051f 100644
--- a/frameworks/base/core/res/res/values/config.xml
+++ b/frameworks/base/core/res/res/values/config.xml
@@ -1607,7 +1607,7 @@
     <!-- Flag indicating whether all audio streams should be mapped to
          one single stream. If true, all audio streams are mapped to
          STREAM_MUSIC as if it's on TV platform. -->
-    <bool name="config_single_volume">false</bool>
+    <bool name="config_single_volume">true</bool>

     <!-- Flag indicating that an outbound call must have a call capable phone account
          that has declared it can process the call's handle. -->