dt-bindings: gpio: pca95xx: Document the TI TCA9535 variant

The TI TCA9535 variant has the same programming model as the NXP PCA9535.

Document the "ti,tca9535" compatible string.
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240531121801.2161154-2-festevam@gmail.comSigned-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Documentation/devicetree/bindings/gpio/gpio-pca95xx.yaml

@@ -66,6 +66,7 @@ properties:
               - ti,tca6408
               - ti,tca6416
               - ti,tca6424
+              - ti,tca9535
               - ti,tca9538
               - ti,tca9539
               - ti,tca9554