Camera: Add HDR scene mode constants.

Change-Id: I78b1f8ca3c1a03222ed363db26d9a09cf0b13528
diff --git a/camera/CameraParameters.cpp b/camera/CameraParameters.cpp
index a657fe3..d10f2e5 100644
--- a/camera/CameraParameters.cpp
+++ b/camera/CameraParameters.cpp
@@ -147,6 +147,7 @@
 const char CameraParameters::SCENE_MODE_PARTY[] = "party";
 const char CameraParameters::SCENE_MODE_CANDLELIGHT[] = "candlelight";
 const char CameraParameters::SCENE_MODE_BARCODE[] = "barcode";
+const char CameraParameters::SCENE_MODE_HDR[] = "hdr";
 
 const char CameraParameters::PIXEL_FORMAT_YUV422SP[] = "yuv422sp";
 const char CameraParameters::PIXEL_FORMAT_YUV420SP[] = "yuv420sp";