serial: Use UPF_* constants with struct uart_port flags

Fix ASYNC_* constant usage that should be the corresponding UPF_*
constant.

CC: Grant Likely <grant.likely@linaro.org>
CC: Rob Herring <robh+dt@kernel.org>
CC: devicetree@vger.kernel.org
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/serial/lantiq.c b/drivers/tty/serial/lantiq.c
index ea030830..4675fe1 100644
--- a/drivers/tty/serial/lantiq.c
+++ b/drivers/tty/serial/lantiq.c
@@ -703,7 +703,7 @@
 	port = &ltq_port->port;
 
 	port->iotype	= SERIAL_IO_MEM;
-	port->flags	= ASYNC_BOOT_AUTOCONF | UPF_IOREMAP;
+	port->flags	= UPF_BOOT_AUTOCONF | UPF_IOREMAP;
 	port->ops	= &lqasc_pops;
 	port->fifosize	= 16;
 	port->type	= PORT_LTQ_ASC,