drm/amdgpu: drop some kernel messages in VCN code

Similar to commit 813e7d4c where some kernel log
messages are dropped. With this commit, more log
messages in older version of VCN/JPEG code are dropped.

Acked-by: Leo Liu <leo.liu@amd.com>
Signed-off-by: David (Ming Qiang) Wu <David.Wu3@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>