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When the HW JPEG decode tests are run by the Tast test framework, the location
of the test file directory will vary. This CL adds the '--test_data_path'
parameter to the test binary, so Tast can overwrite the default test file path.

TEST=ran JPEG decode tests on eve

BUG=899604

Change-Id: I7f242eb4356445a3bc3bb44a9d40221009343c7e
Reviewed-on: https://chromium-review.googlesource.com/c/1328063
Commit-Queue: David Staessens <dstaessens@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607142}