Fix build of cpm_uart due to core changes

Commit ebd2c8f6 "serial: kill off uart_info"

broke the build of this driver, this fixes it.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

drivers/serial/cpm_uart/cpm_uart_core.c

@@ -649,7 +649,7 @@ static int cpm_uart_tx_pump(struct uart_port *port)
 	u8 *p;
 	int count;
 	struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
-	struct circ_buf *xmit = &port->info->xmit;
+	struct circ_buf *xmit = &port->state->xmit;
 
 	/* Handle xon/xoff */
 	if (port->x_char) {