panel/samsung-s6d27a1: Use refcounted allocation in place of devm_kzalloc()

Move to using the new API devm_drm_panel_alloc() to allocate the
panel.

Reviewed-by: Neil Armstrong <[e-mail]>
Signed-off-by: Anusha Srivatsa <[e-mail]>
Link: https://lore.kernel.org/r/20[e-mail]
Signed-off-by: Maxime Ripard <[e-mail]>

drivers/gpu/drm/panel/panel-samsung-s6d27a1.c

···
 	struct s6d27a1 *ctx;
 	int ret;
 
-	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
-	if (!ctx)
-		return -ENOMEM;
+	ctx = devm_drm_panel_alloc(dev, struct s6d27a1, panel,
+				   &s6d27a1_drm_funcs,
+				   DRM_MODE_CONNECTOR_DPI);
+	if (IS_ERR(ctx))
+		return PTR_ERR(ctx);
 
 	ctx->dev = dev;
 
···
 		return dev_err_probe(dev, ret, "MIPI DBI init failed\n");
 
 	ctx->dbi.read_commands = s6d27a1_dbi_read_commands;
-
-	drm_panel_init(&ctx->panel, dev, &s6d27a1_drm_funcs,
-		       DRM_MODE_CONNECTOR_DPI);
 
 	ret = drm_panel_of_backlight(&ctx->panel);
 	if (ret)