dt-bindings: gpio: mrvl-gpio: Fix the gpio-ranges property

The property specifies a list of GPIO-capable pins. Don't limit it to a
single element as there's  presumably more than one GPIO pin.
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Link: https://lore.kernel.org/r/20210121034130.1381872-2-lkundrak@v3.sk'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

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

@@ -82,8 +82,7 @@ properties:
   '#gpio-cells':
     const: 2
 
-  gpio-ranges:
-    maxItems: 1
+  gpio-ranges: true
 
   interrupts: true