drm/i915: remove unnecessary display includes

There are a number of leftover #include "display/..." directives that
are completely unnecessary. Remove them to make it easier to spot the
relevant ones. In one case, switch to a more specific include.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240823123318.3189503-1-jani.nikula@intel.com


Signed-off-by: Jani Nikula <jani.nikula@intel.com>