Add smu_v11_0_set_min_dcef_deep_sleep function for smu11.

v2: fix coding error about set_min_dcef_deep_sleep (Kevin)
Signed-off-by: NKevin Wang <Kevin1.Wang@amd.com>
Signed-off-by: NLikun Gao <Likun.Gao@amd.com>
Reviewed-by: NHuang Rui <ray.huang@amd.com>
Reviewed-by: NKevin Wang <Kevin1.Wang@amd.com>
Acked-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>