We should commit the value after restore them back to default as well.

$ echo "r" > pp_od_clk_voltage
$ echo "c" > pp_od_clk_voltage
Signed-off-by: NHuang Rui <ray.huang@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>