dt-bindings: gpio: pca95xx: add entry for pcal6534 and PI4IOE5V6534Q

The NXP PCAL6534 is a 34-bit I2C I/O expander similar to the PCAL6524. The
Diodes PI4IOE5V6534Q is a functionally identical chip provided by Diodes
Inc.
Signed-off-by: NMartyn Welch <martyn.welch@collabora.com>
Reviewed-by: NKrzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NBartosz Golaszewski <brgl@bgdev.pl>

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

@@ -15,7 +15,12 @@ description: |+
 
 properties:
   compatible:
-    enum:
+    oneOf:
+      - items:
+          - const: diodes,pi4ioe5v6534q
+          - const: nxp,pcal6534
+      - items:
+          - enum:
               - exar,xra1202
               - maxim,max7310
               - maxim,max7312
@@ -50,6 +55,7 @@ properties:
               - nxp,pcal6408
               - nxp,pcal6416
               - nxp,pcal6524
+              - nxp,pcal6534
               - nxp,pcal9535
               - nxp,pcal9554b
               - nxp,pcal9555a