MMC: sdio_uart, remove unused member from sdio_uart_port

tty from struct sdio_uart_port is unused. Proper refcounted tty in
tty_port->tty is used instead. So remove the member from that
structure.
Signed-off-by: NJiri Slaby <jslaby@suse.cz>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/mmc/card/sdio_uart.c

@@ -67,7 +67,6 @@ struct uart_icount {
 struct sdio_uart_port {
 	struct tty_port		port;
 	struct kref		kref;
-	struct tty_struct	*tty;
 	unsigned int		index;
 	struct sdio_func	*func;
 	struct mutex		func_lock;