drm/i915: Simplify intel_ddi_compute_min_voltage_level()

Drop the redundant dev_priv parameters from
intel_ddi_compute_min_voltage_level() to make life easier.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231128115138.13238-9-ville.syrjala@linux.intel.com


Reviewed-by: Gustavo Sousa <gustavo.sousa@intel.com>