amdgpu: pp_od_clk_voltage doesn't have OD_VDDC_CURVE

Hi all,
I try to undervolt gpu core, by executing vc command on pp_od_clk_voltage file, however OD_VDDC_CURVE doesn't exist (pp_od_clk_voltage is attached) there making the setting impossible.

I can modify gpu and memory clock no problem, though. Any ideas?

I'm using ubuntu 20.04.3, kernel 5.8.0.63 (also tried 5.11.0.40), amdgpu 21.40.1.40501-1

edit: I have RX 6700 XT gpu
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