Add new string for audio switcher

Bug: 74130772
Test: rebuild
Change-Id: I31760046ca1754145dfa40049428213f985e8175
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 31b4f90..26fd854 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -9825,6 +9825,9 @@
     <!-- Title for media output settings -->
     <string name="media_output_title">Play media to</string>
 
+    <!-- Summary for media output default settings. (this device) [CHAR LIMIT=30] -->
+    <string name="media_output_default_summary">This device</string>
+
     <!-- Summary for media output settings. (phone) -->
     <string name="media_output_summary" product="default">Phone</string>