This patch adds interface to set min dcef deep sleep for smu. It's to set min deep sleep dce fclk with bootup value from vbios via SetMinDeepSleepDcefclk MSG. v2: add detailed info to describe this function Signed-off-by: Huang Rui <ray.huang@amd.com> Acked-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>