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H A Dimx8mn-beacon-baseboard.dtsi5446ff1a Tue Apr 26 15:51:44 CDT 2022 Adam Ford <aford173@gmail.com> arm64: dts: imx8mn-beacon: Enable RTS-CTS on UART3

There is a header for a DB9 serial port, but any attempts to use
hardware handshaking fail. Enable RTS and CTS pin muxing and enable
handshaking in the uart node.

Signed-off-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>