dt-bindings: serial: 8250_omap: add rs485-rts-active-high

Add rs485-rts-active-high property, this was removed by mistake.
In general we just use rs485-rts-active-low property, however the OMAP
UART for legacy reason uses the -high one.

Fixes: 767d346 ("dt-bindings: serial: 8250_omap: drop rs485 properties")
Closes: https://lore.kernel.org/all/[email protected]/
Signed-off-by: Francesco Dolcini <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: dolcini

Documentation/devicetree/bindings/serial/8250_omap.yaml

@@ -70,6 +70,7 @@ properties:
   dsr-gpios: true
   rng-gpios: true
   dcd-gpios: true
+  rs485-rts-active-high: true
   rts-gpio: true
   power-domains: true
   clock-frequency: true