drm/i915/display: prefer intel_de_wait*() functions over uncore ones

Prefer the intel_de_wait*() functions over the uncore interface.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Gustavo Sousa <gustavo.sousa@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240320160123.2904609-2-jani.nikula@intel.com