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>