Add function to print current levels for smu11.

v2: expose get_current_clk_freq for smu v11. (Kevin)
Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Signed-off-by: Kevin Wang <Kevin1.Wang@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>