drm/amdgpu/mes: drop MES 10.x leftovers

Leftover from MES bring up.  There is no production
MES support for MES 10.x.  The rest of the MES 10.x
code has already been removed so drop this.

Acked-by: Prike Liang <Prike.Liang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>