drm/i915: Align PLANE_SURF to 16k on ADL for async flips

drm/i915: Align PLANE_SURF to 16k on ADL for async flips

On ADL async flips apparently generate DMAR and GGTT faults
(with accompanying visual glitches) unless PLANE_SURF is
aligned to at least 16k. Bump up the alignment to 16k.

TODO: analyze things better to figure out what is really
      going on here

Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240430095639.26390-2-ville.syrjala@linux.intel.com