drm/amdgpu/vcn: Add vcn firmware log
vcn fwlog is for debugging purpose only, by default, it is disabled. Signed-off-by: Ruijing Dong <ruijing.dong@amd.com> Reviewed-by: Leo Liu <leo.liu@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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