ARM: dts: imx6sx: Add missing UART RTS/CTS pins mux

Some of UART RTS/CTS pins' DCE/DTE mux function are missing,
add them.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
1 file changed