MTP: Improve MtpProperty logging support

Change-Id: I46800b99763edcc5e994d912941f9f5e9b1c94d2
Signed-off-by: Mike Lockwood <lockwood@android.com>
diff --git a/media/mtp/MtpDevice.h b/media/mtp/MtpDevice.h
index 6eba8c8..c7ba7db 100644
--- a/media/mtp/MtpDevice.h
+++ b/media/mtp/MtpDevice.h
@@ -67,6 +67,7 @@
 
     void                    initialize();
     void                    close();
+    void                    print();
     const char*             getDeviceName();
 
     bool                    openSession();