drm/amdgpu: remove redundant enable_mes and enable_mes_kiq

enable_mes and enable_mes_kiq are set in both device init and
MES IP init. Leave the ones in MES IP init, since it is
a more accurate way to judge from GC IP version.

Signed-off-by: Yifan Zhang <yifan1.zhang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Jack Xiao <Jack.Xiao@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>