dt-bindings: mfd: syscon: Drop hwlocks

Apparently there is no in-tree DTS syscon node having hwlocks, so drop
the property to simplify the binding.
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240626-dt-bindings-mfd-syscon-split-v3-1-3409903bb99b@linaro.orgSigned-off-by: Lee Jones <lee@kernel.org>

Documentation/devicetree/bindings/mfd/syscon.yaml

@@ -112,11 +112,6 @@ properties:
   resets:
     maxItems: 1
 
-  hwlocks:
-    maxItems: 1
-    description:
-      Reference to a phandle of a hardware spinlock provider node.
-
 required:
   - compatible
   - reg