dt-bindings: mtd: amlogic,meson-nand: drop unneeded quotes

Drop unneeded quotes over simple string values to fix recently enabled
yamllint warning:

  [error] string value is redundantly quoted with any quotes (quoted-strings)

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20230826093852.9334-1-krzysztof.kozlowski@linaro.org

Author: krzk

Documentation/devicetree/bindings/mtd/amlogic,meson-nand.yaml

@@ -67,8 +67,8 @@ patternProperties:
     unevaluatedProperties: false
 
     dependencies:
-      nand-ecc-strength: ['nand-ecc-step-size']
-      nand-ecc-step-size: ['nand-ecc-strength']
+      nand-ecc-strength: [nand-ecc-step-size]
+      nand-ecc-step-size: [nand-ecc-strength]
 
 
 required: