drm/panel/boe-himax8279d: 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-v1-14-de73ba81b2f5@redhat.com
Signed-off-by: Maxime Ripard <mripard@kernel.org>

Author: anushasrivats

drivers/gpu/drm/panel/panel-boe-himax8279d.c

@@ -847,9 +847,6 @@ static int panel_add(struct panel_info *pinfo)
 						 "failed to get enable gpio\n");
 	}
 
-	drm_panel_init(&pinfo->base, dev, &panel_funcs,
-		       DRM_MODE_CONNECTOR_DSI);
-
 	ret = drm_panel_of_backlight(&pinfo->base);
 	if (ret)
 		return ret;
@@ -865,9 +862,11 @@ static int panel_probe(struct mipi_dsi_device *dsi)
 	const struct panel_desc *desc;
 	int err;
 
-	pinfo = devm_kzalloc(&dsi->dev, sizeof(*pinfo), GFP_KERNEL);
-	if (!pinfo)
-		return -ENOMEM;
+	pinfo = devm_drm_panel_alloc(&dsi->dev, __typeof(*pinfo), base,
+				     &panel_funcs, DRM_MODE_CONNECTOR_DSI);
+
+	if (IS_ERR(pinfo))
+		return PTR_ERR(pinfo);
 
 	desc = of_device_get_match_data(&dsi->dev);
 	dsi->mode_flags = desc->mode_flags;