dt-bindings: apple,aic: Fix required item "apple,fiq-index" in affinity description

The required list used "fiq-index" instead of "apple,fiq-index"
described as property and used in the dts. Add the missing "apple,"
prefix.

Fixes: dba07ad ("dt-bindings: apple,aic: Add affinity description for per-cpu pseudo-interrupts")
Signed-off-by: Janne Grunau <[email protected]>
Acked-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Herring <[email protected]>

Author: jannau

Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml

@@ -96,7 +96,7 @@ properties:
               Documentation/devicetree/bindings/arm/cpus.yaml).
 
         required:
-          - fiq-index
+          - apple,fiq-index
           - cpus
 
 required: