SMU11 based similar to navi1x.

v2: squash in SMU IF updates
Signed-off-by: NLikun Gao <Likun.Gao@amd.com>
Reviewed-by: NEvan Quan <evan.quan@amd.com>
Reviewed-by: NKevin Wang <kevin1.wang@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>