drm/amdgpu: revert "fix limiting AV1 to the first instance on VCN3" v3

This reverts commit 250195ff

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The job should now be initialized when we reach the parser functions.

v2: merge improved application check into this patch
v3: back to the original test, but use the right ring

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>