vda: Rename Exynos VDA to V4L2 VDA

content/common/gpu/testdata/red-green.README

 red-green video files in this directory and their provenance:
 
 red-green.h264:
   Using ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, generated with
   red-green.mp4 (https://codereview.chromium.org/8342021):
   ffmpeg -i red-green.mp4 -vcodec copy -vbsf h264_mp4toannexb \
       -an red-green.h264
 
 red-green.h264.md5:
   MD5s of RGB thumbnail rendered version of red-green.h264 decoded with Intel
-  VAAPI on Ivy Bridge and Sandy Bridge and Exynos EVDA.
+  VAAPI on Ivy Bridge and Sandy Bridge and V4L2VDA on Exynos.
   Written out by video_decode_accelerator_unittest.
   These differ between implementations because color space-converted frames are
   not specified to the last bit and GLES shader/texture filtering
   precision varies.
 
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