drm/amdkfd: fill in data for control stack header for gfx10

The debugger requires the control stack header to be filled in to
update_waves.

Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Jonathan Kim <jonathan.kim@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>