dt-bindings: serial: 8250_omap: Drop redundant properties

The binding references in-kernel serial.yaml, so there is no need to
explicitly list its properties.  Note that rts-gpio is also redundant
because DTS should be simply converted to -gpios variants.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20250514125127.56149-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: krzk

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

@@ -64,14 +64,7 @@ properties:
   clock-names:
     const: fclk
 
-  rts-gpios: true
-  cts-gpios: true
-  dtr-gpios: true
-  dsr-gpios: true
-  rng-gpios: true
-  dcd-gpios: true
   rs485-rts-active-high: true
-  rts-gpio: true
   power-domains: true
   clock-frequency: true
   current-speed: true