Add low latency audio feature in manifest.

... but make it optional

app/src/main/AndroidManifest.xml

@@ -18,6 +18,9 @@
   <uses-feature android:name="android.hardware.usb.host" android:required="false" />
   <!-- External mouse input events -->
   <uses-feature android:name="android.hardware.type.pc" android:required="false" />
+  <!-- Low latency audio -->
+  <uses-feature android:name="android.hardware.audio.low_latency" android:required="false" />
+  <uses-feature android:name="android.hardware.audio.pro" android:required="false" />
 
   <application
       android:allowBackup="true"