drm/i915/dpll: Use intel_display for asserting pll

drm/i915/dpll: Use intel_display for asserting pll

Use intel_display instead of drm_i915_private to assert pll enabled
and disabled and the corresponding changes needed to make that happen.

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250212074542.3569452-6-suraj.kandpal@intel.com