Add sys interface to get socclk, fclk and dcefclk for smu.
Signed-off-by: NLikun Gao <Likun.Gao@amd.com>
Reviewed-by: NGui Chengming <Jack.Gui@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>