spi: dt-bindings: Make "additionalProperties: true" explicit

Make it explicit that child nodes have additional properties and the
child node schema is not complete. The complete schemas are applied
separately based the compatible strings.

Signed-off-by: Rob Herring <[e-mail]>
Acked-by: Jernej Skrabec <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/spi/allwinner,sun4i-a10-spi.yaml

···
 patternProperties:
   "^.*@[0-9a-f]+":
     type: object
+    additionalProperties: true
+
     properties:
       reg:
         items:

Documentation/devicetree/bindings/spi/allwinner,sun6i-a31-spi.yaml

···
 patternProperties:
   "^.*@[0-9a-f]+":
     type: object
+    additionalProperties: true
+
     properties:
       reg:
         items:

Documentation/devicetree/bindings/spi/nvidia,tegra210-quad.yaml

···
 patternProperties:
   "@[0-9a-f]+$":
     type: object
+    additionalProperties: true
 
     properties:
       spi-rx-bus-width:

Documentation/devicetree/bindings/spi/rockchip-sfc.yaml

···
 patternProperties:
   "^flash@[0-3]$":
     type: object
+    additionalProperties: true
+
     properties:
       reg:
         minimum: 0

Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml

···
 patternProperties:
   "^.*@[0-9a-f]+$":
     type: object
+    additionalProperties: true
+
     properties:
       reg:
         minimum: 0