drm/amdkfd: use map_queues for hiq on gfx v10 as well

To align with gfx v9, we use the map_queues packet to load hiq MQD.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>