drm/amd/powerplay: add function to store overdrive information for smu11

drm/amd/powerplay: add function to store overdrive information for smu11

Add vega20_setup_od8_information function to store overdrive information
from powerplay_table to smu_table which will used when setting od8.

Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>