dt-bindings: memory-controllers: fsl,imx-weim: Fix "fsl,weim-cs-timing" schema

The "fsl,weim-cs-timing" property is an array, but the constraints in
the if/then schema are for a matrix. That worked fine when all
properties were decoded into a matrix, but now dtschema decodes
properties into scalars and arrays based on their type.

Signed-off-by: Rob Herring (Arm) <[e-mail]>
Acked-by: Peng Fan <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

Documentation/devicetree/bindings/memory-controllers/fsl/fsl,imx-weim.yaml

···
           properties:
             fsl,weim-cs-timing:
               items:
-                items:
-                  - description: CSxU
-                  - description: CSxL
+                - description: CSxU
+                - description: CSxL
   - if:
       properties:
         compatible:
···
           properties:
             fsl,weim-cs-timing:
               items:
-                items:
-                  - description: CSCRxU
-                  - description: CSCRxL
-                  - description: CSCRxA
+                - description: CSCRxU
+                - description: CSCRxL
+                - description: CSCRxA
   - if:
       properties:
         compatible:
···
           properties:
             fsl,weim-cs-timing:
               items:
-                items:
-                  - description: CSxGCR1
-                  - description: CSxGCR2
-                  - description: CSxRCR1
-                  - description: CSxRCR2
-                  - description: CSxWCR1
-                  - description: CSxWCR2
+                - description: CSxGCR1
+                - description: CSxGCR2
+                - description: CSxRCR1
+                - description: CSxRCR2
+                - description: CSxWCR1
+                - description: CSxWCR2
 
 additionalProperties: false