drm/i915/audio: don't set LPE audio irq chip data, it's unused

Nobody uses the irq chip data. Stop setting it, and as a bonus get rid
of another struct drm_i915_private * reference.

Reviewed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Link: https://lore.kernel.org/r/d75ec986093c912de67a42782aa5a49357a9f8e5.1744222449.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/intel_lpe_audio.c

@@ -179,7 +179,7 @@ static int lpe_audio_irq_init(struct intel_display *display)
 				handle_simple_irq,
 				"hdmi_lpe_audio_irq_handler");
 
-	return irq_set_chip_data(irq, dev_priv);
+	return 0;
 }
 
 static bool lpe_audio_detect(struct intel_display *display)