tests/amdgpu: add missing header to SOURCES

Fixes the tarball generation.

fixes: 9d133dd08720d80dfc8ce098bf0972 (tests/amdgpu: add uvd encode unit tests)
bug: https://bugs.freedesktop.org/show_bug.cgi?id=102391
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
1 file changed