dt-bindings: mtd: stm32: Prevent NAND chip unevaluated properties

List all the possible properties in the NAND chip as per the example and
set unevaluatedProperties to false in the NAND chip section.

Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Christophe Kerello <christophe.kerello@foss.st.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/linux-mtd/20230619092916.3028470-15-miquel.raynal@bootlin.com

Documentation/devicetree/bindings/mtd/st,stm32-fmc2-nand.yaml

@@ -37,6 +37,7 @@ properties:
 patternProperties:
   "^nand@[a-f0-9]$":
     type: object
+    $ref: raw-nand-chip.yaml
     properties:
       nand-ecc-step-size:
         const: 512
@@ -44,6 +45,8 @@ patternProperties:
       nand-ecc-strength:
         enum: [1, 4, 8]
 
+    unevaluatedProperties: false
+
 allOf:
   - $ref: nand-controller.yaml#