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Currently, all VA-API related unit tests are executed via
chromeos_camera's jpeg_decode_accelerator_unittest test binary.

This CL adds a test target for VA-API unit tests to set the ground for
the separation of VA-API related unit tests from chromeos_camera.

I am also using this opportunity to remove code duplication that exists
in vaapi_*_decoder_unittest.cc by introducing
vaapi_image_decoter_test_common.*. However this change is not crucial
for the separation mentioned above.

Bug: 986074
Test: Run and passes locally on an Eve board.
Change-Id: I17a27ad7f57b22dd7704293b798531d38fc72bf8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881631
Commit-Queue: Gil Dekel <gildekel@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710073}