Fix compiler warnings in Camera3 service code.

- Removes unsed mDepth variable
- Fixes the type of count in getRawOpaqueBufferSize

Bug: 27149500
Change-Id: I7d5010cb513f9163c8bb6bf4ab427e54ee9d4963
diff --git a/services/camera/libcameraservice/device3/Camera3ZslStream.cpp b/services/camera/libcameraservice/device3/Camera3ZslStream.cpp
index eefcb44..7414c4c 100644
--- a/services/camera/libcameraservice/device3/Camera3ZslStream.cpp
+++ b/services/camera/libcameraservice/device3/Camera3ZslStream.cpp
@@ -115,8 +115,7 @@
         Camera3OutputStream(id, CAMERA3_STREAM_BIDIRECTIONAL,
                             width, height,
                             HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED,
-                            HAL_DATASPACE_UNKNOWN, CAMERA3_STREAM_ROTATION_0),
-        mDepth(bufferCount) {
+                            HAL_DATASPACE_UNKNOWN, CAMERA3_STREAM_ROTATION_0) {
 
     sp<IGraphicBufferProducer> producer;
     sp<IGraphicBufferConsumer> consumer;