[LE] Add api to check the media device is BT LE device

Bug: 228274114
Test: Manual test
Change-Id: Idb65ebe3b6afa2b6376036a0a4b5fa442460e8fb

packages/SettingsLib/src/com/android/settingslib/media/MediaDevice.java

@@ -249,6 +249,15 @@ public abstract class MediaDevice implements Comparable<MediaDevice> {
         return mRouteInfo.getClientPackageName();
     }
 
+    /**
+     * Check if the device is Bluetooth LE Audio device.
+     *
+     * @return true if the RouteInfo equals TYPE_BLE_HEADSET.
+     */
+    public boolean isBLEDevice() {
+        return mRouteInfo.getType() == TYPE_BLE_HEADSET;
+    }
+
     /**
      * Get application label from MediaDevice.
      *