dt-bindings: pwm: rockchip: Document rv1126-pwm

Document pwm compatible for rv1126 which is fallback compatible
of rk3328-pwm group.

Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230731103518.2906147-2-jagan@edgeble.ai
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: openedev

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

@@ -32,6 +32,7 @@ properties:
               - rockchip,rk3308-pwm
               - rockchip,rk3568-pwm
               - rockchip,rk3588-pwm
+              - rockchip,rv1126-pwm
           - const: rockchip,rk3328-pwm
 
   reg: