dts: bindings: nxp-uart: add hw-flow-control binding

Support for HW flow control was recently enabled in the NXP MCUX
HAL layer.  Let's add a DTS binding definition for "hw-flow-control".
The MCUX uart driver shim can use this to enable HW flow control.

Signed-off-by: Michael Scott <mike@foundries.io>
1 file changed