CTest updates. (#473)

* * rocDecode: Core test updates.
 - Added VP9 test.
 - Added tests for video decode raw sample.
 - Changed test video streams to raw elementary or IVF formats.

* * rocDecode/CTest: Added back mp4 files.

* * rocDecode/CTest: Minor changes based on review comments.

* * rocDecode/CTest: Added stream file installation.

* * rocDecode/CTest: Changed the file back to mp4.

* Add support for VP9 handling in the videoDecodeBatch sample

* add linking with threads for videodecode app

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Co-authored-by: Aryan Salmanpour <aryan.salmanpour@amd.com>

[ROCm/rocdecode commit: 597b29a7c9]

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