dt-bindings: serial: samsung: add exynosautov920-uart compatible

Add samsung,exynosautov9-uart dedicated compatible for representing
uart of ExynosAutov920 SoC.
Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com>
Link: https://lore.kernel.org/r/20231115095609.39883-5-jaewon02.kim@samsung.comSigned-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Documentation/devicetree/bindings/serial/samsung_uart.yaml

@@ -35,7 +35,9 @@ properties:
               - samsung,exynos7885-uart
           - const: samsung,exynos5433-uart
       - items:
-          - const: samsung,exynosautov9-uart
+          - enum:
+              - samsung,exynosautov9-uart
+              - samsung,exynosautov920-uart
           - const: samsung,exynos850-uart
 
   reg: