Camera: Add hidden experimental tearDown method.

Bug: 18949148
Change-Id: Ie86ec7d1ec3db54e1154563b2339a208a935f849
diff --git a/services/camera/libcameraservice/device3/Camera3Device.h b/services/camera/libcameraservice/device3/Camera3Device.h
index 31b6132..140da98 100644
--- a/services/camera/libcameraservice/device3/Camera3Device.h
+++ b/services/camera/libcameraservice/device3/Camera3Device.h
@@ -141,6 +141,8 @@
 
     virtual status_t prepare(int streamId);
 
+    virtual status_t tearDown(int streamId);
+
     virtual uint32_t getDeviceVersion();
 
     virtual ssize_t getJpegBufferSize(uint32_t width, uint32_t height) const;