drm/amdgpu/gfx10: implement mqd functions of gfx/compute eng v2

Refine the existing gfx/compute mqd functions, and add them
to engine mqd layer.

v2: rebase fix.
Signed-off-by: Jack Xiao <Jack.Xiao@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>