[Audiosharing] Add hysteresis mode fix flag.

Test: compile
Bug: 355222285
Flag: EXEMPT add flag
Change-Id: Ia14e5da16cb92e2d866154392d8b4178eb879586
diff --git a/packages/SettingsLib/aconfig/settingslib.aconfig b/packages/SettingsLib/aconfig/settingslib.aconfig
index 0d124e8..2b3862f 100644
--- a/packages/SettingsLib/aconfig/settingslib.aconfig
+++ b/packages/SettingsLib/aconfig/settingslib.aconfig
@@ -119,3 +119,13 @@
     purpose: PURPOSE_BUGFIX
   }
 }
+
+flag {
+    name: "audio_sharing_hysteresis_mode_fix"
+    namespace: "cross_device_experiences"
+    description: "Gates whether to enable fix for hysteresis mode"
+    bug: "355222285"
+    metadata {
+        purpose: PURPOSE_BUGFIX
+    }
+}