GitLab

v2: - check clk against OverDrive limits from VBIOS
    - set OD flag when user commit the setting.
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>