drm/amdgpu: fallback to old RAS error message for aqua_vanjaram

So driver doesn't generate incorrect message until
the new format is settled down for aqua_vanjaram

Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Yang Wang <kevinyang.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>