Camera: Disallow dumping clients directly

Camera service dumps should only be initiated through
ICameraService::dump.

Bug: 26265403
Change-Id: If3ca4718ed74bf33ad8a416192689203029e2803
diff --git a/services/camera/libcameraservice/api1/CameraClient.h b/services/camera/libcameraservice/api1/CameraClient.h
index 4b89564..a270f90 100644
--- a/services/camera/libcameraservice/api1/CameraClient.h
+++ b/services/camera/libcameraservice/api1/CameraClient.h
@@ -69,7 +69,9 @@
 
     status_t initialize(camera_module_t *module);
 
-    status_t dump(int fd, const Vector<String16>& args);
+    virtual status_t dump(int fd, const Vector<String16>& args);
+
+    virtual status_t dumpClient(int fd, const Vector<String16>& args);
 
 private: