drm/i915: move a few HAS_ macros closer to their place

There's not that much organization with where the various HAS_FEATURE()
macros are placed, but at least try to group them closer together.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230118131538.3558599-4-jani.nikula@intel.com