media: add OMX_VIDEO_CodingDolbyVision.

Bug: 25684127
Change-Id: I4eccb66d679a3dd4ac47556a0d206df2ebf52338
diff --git a/include/media/openmax/OMX_Video.h b/include/media/openmax/OMX_Video.h
index decc410..ca85cf1 100644
--- a/include/media/openmax/OMX_Video.h
+++ b/include/media/openmax/OMX_Video.h
@@ -88,6 +88,7 @@
     OMX_VIDEO_CodingVP8,        /**< Google VP8, formerly known as On2 VP8 */
     OMX_VIDEO_CodingVP9,        /**< Google VP9 */
     OMX_VIDEO_CodingHEVC,       /**< ITU H.265/HEVC */
+    OMX_VIDEO_CodingDolbyVision,/**< Dolby Vision */
     OMX_VIDEO_CodingKhronosExtensions = 0x6F000000, /**< Reserved region for introducing Khronos Standard Extensions */
     OMX_VIDEO_CodingVendorStartUnused = 0x7F000000, /**< Reserved region for introducing Vendor Extensions */
     OMX_VIDEO_CodingMax = 0x7FFFFFFF