drm/i915: Introduce pin_params.needs_low_address

drm/i915: Introduce pin_params.needs_low_address

Add a new flag pin_params.needs_low_address to inform the pinning
code that the display needs a low ggtt address.

The goal is to eliminate all display specific stuff from
the low level pinning code (the direct intel_plane_needs_low_addres())
call in this case).

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260416174448.28264-7-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>