drm/amdgpu: switch to v9_4_3 gfx_funcs callbacks for GC 9.4.3

add gfx_funcs callbacks implemenation based on
gc_v9_4_3 ip headers

Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Le Ma <le.ma@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>