drm/amd/pm: correct polaris10 clock stretcher data table setting

By using the saved copy of ro_range_maximum and ro_range_minimum.
Correct the setting for "LdoRefSel".

Signed-off-by: Evan Quan <evan.quan@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>