Revert "drm/amdgpu:update kernel vcn ring test"

VCN FW depncencies revert it to unblock others

This reverts commit f3fa86f5

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Signed-off-by: Saleemkhan Jamadar <saleemkhan.jamadar@amd.com>
Acked-by: Veerabadhran Gopalakrishnan <Veerabadhran.Gopalakrishnan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>