drm/amdgpu/soc21: don't expose AV1 if VCN0 is harvested

[ Upstream commit a6de636e

 ]

Only VCN0 supports AV1.

Reviewed-by: Leo Liu <leo.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Stable-dep-of: 6ce2ea07

 ("drm/amdgpu/soc21: Add video cap query support for VCN_4_0_4")
Signed-off-by: Sasha Levin <sashal@kernel.org>