tty: serial: omap: add UPF_BOOT_AUTOCONF flag for DT init

The UPF_BOOT_AUTOCONF flag is needed for proper
flow control support.
Acked-by: NPavel Machek <pavel@ucw.cz>
Signed-off-by: NSebastian Reichel <sre@kernel.org>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

drivers/tty/serial/omap-serial.c

@@ -1597,6 +1597,9 @@ static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev)
 
 	of_property_read_u32(dev->of_node, "clock-frequency",
 					 &omap_up_info->uartclk);
+
+	omap_up_info->flags = UPF_BOOT_AUTOCONF;
+
 	return omap_up_info;
 }