Revert "serial: serial_xen: print U-Boot banner and others"

This reverts commit 18426bf0.
Signed-off-by: NTom Rini <trini@konsulko.com>

drivers/serial/serial_xen.c

@@ -175,6 +175,8 @@ U_BOOT_DRIVER(serial_xen) = {
 	.priv_auto_alloc_size	= sizeof(struct xen_uart_priv),
 	.probe			= xen_serial_probe,
 	.ops			= &xen_serial_ops,
+#if !CONFIG_IS_ENABLED(OF_CONTROL)
 	.flags			= DM_FLAG_PRE_RELOC,
+#endif
 };