Camera: fix format overriden logic

Original logic was comparing an overridden format int, switch
to use a const original format.

Test: partner device, Pixel 3 CTS
Bug: 136456900
Change-Id: I03d6e190770ee05e40446c417e323f546fdc2689
diff --git a/services/camera/libcameraservice/device3/Camera3Stream.h b/services/camera/libcameraservice/device3/Camera3Stream.h
index 533318f..67afd0f 100644
--- a/services/camera/libcameraservice/device3/Camera3Stream.h
+++ b/services/camera/libcameraservice/device3/Camera3Stream.h
@@ -582,9 +582,9 @@
     static const int32_t kBufferLimitLatencyBinSize = 33; //in ms
     CameraLatencyHistogram mBufferLimitLatency;
 
-    //Keep track of original format in case it gets overridden
+    //Keep track of original format when the stream is created in case it gets overridden
     bool mFormatOverridden;
-    int mOriginalFormat;
+    const int mOriginalFormat;
 
     //Keep track of original dataSpace in case it gets overridden
     bool mDataSpaceOverridden;