Hide volume slider in Output Switcher when volume adjustment is restricted

-Check UserManager.DISALLOW_ADJUST_VOLUME
-Hide slider when unsupported

Bug: 153922342
Test: 1.Open CTS-V app > Device Owner Tests
2.install CtsEmptyDeviceOwner.apk -"adb install -r -t CtsEmptyDeviceOwner.apk"
3.enter the command "adb shell dpm set-device-owner com.android.cts.emptydeviceowner/.EmptyDeviceAdmin"
4.push Check device owner button
5.open Policy transparency test and go to Disallow adjust volume > Enable the switch > Open settings.

Change-Id: Iac2793ead6d93d4eaada19c4eec33885d4b97138

src/com/android/settings/media/MediaDeviceUpdateWorker.java

@@ -26,11 +26,14 @@ import android.content.Intent;
 import android.content.IntentFilter;
 import android.media.AudioManager;
 import android.net.Uri;
+import android.os.UserHandle;
+import android.os.UserManager;
 import android.text.TextUtils;
 
 import androidx.annotation.VisibleForTesting;
 
 import com.android.settings.slices.SliceBackgroundWorker;
+import com.android.settingslib.RestrictedLockUtilsInternal;
 import com.android.settingslib.Utils;
 import com.android.settingslib.media.LocalMediaManager;
 import com.android.settingslib.media.MediaDevice;
@@ -214,6 +217,17 @@ public class MediaDeviceUpdateWorker extends SliceBackgroundWorker
         return mPackageName;
     }
 
+    boolean hasAdjustVolumeUserRestriction() {
+        if (RestrictedLockUtilsInternal.checkIfRestrictionEnforced(
+                mContext, UserManager.DISALLOW_ADJUST_VOLUME, UserHandle.myUserId()) != null) {
+            return true;
+        }
+        final UserManager um = (UserManager) mContext.getSystemService(Context.USER_SERVICE);
+        return um.hasBaseUserRestriction(UserManager.DISALLOW_ADJUST_VOLUME,
+                UserHandle.of(UserHandle.myUserId()));
+
+    }
+
     private class DevicesChangedBroadcastReceiver extends BroadcastReceiver {
         @Override
         public void onReceive(Context context, Intent intent) {