drm/amdgpu/gfx11: fix me field handling in map_queue packet

Select the correct microengine (me) when using the
map_queue packet.  There are different me's for GFX,
compute, and scheduling.

Signed-off-by: Jack Xiao <Jack.Xiao@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>