Camera: Allocate correctly-sized buffers for DEPTH_POINT_CLOUD

Bug: 20537722
Change-Id: I9fa2fcdcfd41cd3370732c70414914993d3dc94e
diff --git a/services/camera/libcameraservice/device3/Camera3Device.h b/services/camera/libcameraservice/device3/Camera3Device.h
index 140da98..eea34af 100644
--- a/services/camera/libcameraservice/device3/Camera3Device.h
+++ b/services/camera/libcameraservice/device3/Camera3Device.h
@@ -146,6 +146,7 @@
     virtual uint32_t getDeviceVersion();
 
     virtual ssize_t getJpegBufferSize(uint32_t width, uint32_t height) const;
+    ssize_t getPointCloudBufferSize() const;
 
     // Methods called by subclasses
     void             notifyStatus(bool idle); // updates from StatusTracker