drm/amdgpu: remove repeat code for mes_add_queue_pkt

The setting of mes_add_queue_pkt is repeated, so remove it.

Signed-off-by: Bob Zhou <bob.zhou@amd.com>
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>