We only want to enable hardware flow control if RTS/CTS pins
are connected.
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>
Signed-off-by: NMarkus Pargmann <mpa@pengutronix.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>