dt-bindings: pwm: samsung: add exynosautov920 compatible

Add samsung,exynosautov920-pwm compatible string to binding document.
Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20231115095609.39883-6-jaewon02.kim@samsung.comSigned-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Documentation/devicetree/bindings/pwm/pwm-samsung.yaml

@@ -32,6 +32,7 @@ properties:
               - samsung,exynos5433-pwm
               - samsung,exynos7-pwm
               - samsung,exynosautov9-pwm
+              - samsung,exynosautov920-pwm
           - const: samsung,exynos4210-pwm
 
   reg: