drm/i915/display: Move intel_psr_post_plane_update() at the later

drm/i915/display: Move intel_psr_post_plane_update() at the later

In intel_post_plane_update() there are things which might need to do
vblank waits, so enabling PSR as early as we do now is simply
counter-productive. Therefore move intel_psr_post_plane_update() at the
last of intel_post_plane_update().

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Link: https://lore.kernel.org/r/20250324133248.4071909-5-ankit.k.nautiyal@intel.com