drm/i915: reduce intel_wakeref.h dependencies

drm/i915: reduce intel_wakeref.h dependencies

Forward declare struct drm_printer instead of including drm/drm_print.h,
as we only need the pointer. Turns out quite a few places depend on this
include implicitly. Make them explicit.

Some of the includes are just stale and unnecessary. Group the forward
declarations together while at it.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://lore.kernel.org/r/20250326115452.2090275-1-jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>