drm/amdkfd: Add kfd2kgd_funcs for navy_flounder kfd support

Add callbacks to KGD for navy flounder.

Signed-off-by: Chengming Gui <Jack.Gui@amd.com>
Reviewed-by: Tao Zhou <tao.zhou1@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>