drm/panel/ilitek-ili9882t: Use refcounted allocation in place of devm_kzalloc()

Move to using the new API devm_drm_panel_alloc() to allocate the
panel. In the call to the new API, avoid using explicit type and use
__typeof() for more type safety.

Signed-off-by: Anusha Srivatsa <asrivats@redhat.com>
Link: https://lore.kernel.org/r/20250710-b4-driver-convert-last-part-july-v1-11-de73ba81b2f5@redhat.com
Signed-off-by: Maxime Ripard <mripard@kernel.org>

Author: anushasrivats

drivers/gpu/drm/panel/panel-ilitek-ili9882t.c

@@ -614,8 +614,6 @@ static int ili9882t_add(struct ili9882t *ili)
 
 	gpiod_set_value(ili->enable_gpio, 0);
 
-	drm_panel_init(&ili->base, dev, &ili9882t_funcs,
-		       DRM_MODE_CONNECTOR_DSI);
 	err = of_drm_get_panel_orientation(dev->of_node, &ili->orientation);
 	if (err < 0) {
 		dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, err);
@@ -640,9 +638,11 @@ static int ili9882t_probe(struct mipi_dsi_device *dsi)
 	int ret;
 	const struct panel_desc *desc;
 
-	ili = devm_kzalloc(&dsi->dev, sizeof(*ili), GFP_KERNEL);
-	if (!ili)
-		return -ENOMEM;
+	ili = devm_drm_panel_alloc(&dsi->dev, __typeof(*ili), base,
+				   &ili9882t_funcs, DRM_MODE_CONNECTOR_DSI);
+
+	if (IS_ERR(ili))
+		return PTR_ERR(ili);
 
 	desc = of_device_get_match_data(&dsi->dev);
 	dsi->lanes = desc->lanes;