efi: app: Add a simple-framebuffer node if enabled

The EFI app cannot make the EFI GOP available to Linux directly, since
it calls exit-boot-services before booting Linux. The easiest way to
provide an early console is with the simple-framebuffer feature. Add
this node to the devicetree if the feature is enabled.

Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <sjg@chromium.org>

lib/efi_client/efi_app.c

@@ -348,9 +348,11 @@ int ft_system_setup(void *fdt, struct bd_info *bd)
 		return ret;
 	}
 
-	ret = fdt_simplefb_add_node(fdt);
-	if (ret)
-		log_warning("failed to set up simplefb\n");
+	if (IS_ENABLED(CONFIG_FDT_SIMPLEFB)) {
+		ret = fdt_simplefb_add_node(fdt);
+		if (ret)
+			log_warning("failed to set up simplefb\n");
+	}
 
 	free(map);