drm/radeon/dpm: drop clk/voltage dependency filters for NI

No longer needed now that the underlying bug was fixed in
b0880e87
(drm/radeon/dpm: fix vddci setup typo on cayman).

bug:
https://bugs.freedesktop.org/show_bug.cgi?id=69721



Reviewed-by: Alexandre Demers <alexandre.f.demers@gmail.com>
Tested-by: Alexandre Demers <alexandre.f.demers@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>