drm/amdgpu/mes: clean up SDMA HQD loop

Follow the same logic as the other IP types.

Reviewed-by: Prike Liang <Prike.Liang@amd.com>
Acked-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>