drm/amdgpu/powerplay: fix typo in mvdd table setup

drm/amdgpu/powerplay: fix typo in mvdd table setup

Polaris and vegam use count for the value rather than
level.  This looks like a copy paste typo from when
the code was adapted from previous asics.

I'm not sure that the SMU actually uses this value, so
I don't know that it actually is a bug per se.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=108609
Reported-by: Robert Strube <rstrube@gmail.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>