dt-bindings: watchdog: sunxi: fix error in schema

"maxItems" is not needed with an "items" list

Fixes:
$ DT_SCHEMA_FILES=Documentation/devicetree/bindings/watchdog/allwinner,sun4i-a10-wdt.yaml make dtbs_check
Documentation/devicetree/bindings/watchdog/allwinner,sun4i-a10-wdt.yaml: properties:clocks: {'required': ['maxItems']} is not allowed for {'minItems': 1, 'maxItems': 2, 'items': [{'description': 'High-frequency oscillator input, divided internally'}, {'description': 'Low-frequency oscillator input, only found on some variants'}]}
hint: "maxItems" is not needed with an "items" list
from schema $id: http://devicetree.org/meta-schemas/items.yaml#
...

Signed-off-by: David Heidelberg <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/devicetree/bindings/watchdog/allwinner,sun4i-a10-wdt.yaml

···
 
   clocks:
     minItems: 1
-    maxItems: 2
     items:
       - description: High-frequency oscillator input, divided internally
       - description: Low-frequency oscillator input, only found on some variants
 
   clock-names:
     minItems: 1
-    maxItems: 2
     items:
       - const: hosc
       - const: losc