dt-bindings: mmc: mmc-spi-slot: Change voltage-ranges to uint32-matrix

According to common mmc core, voltages-ranges should be matrix.
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20240613-ls_waring_esdhc-v5-1-36644e2fe21c@nxp.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Documentation/devicetree/bindings/mmc/mmc-spi-slot.yaml

@@ -27,17 +27,19 @@ properties:
     maxItems: 1
 
   voltage-ranges:
-    $ref: /schemas/types.yaml#/definitions/uint32-array
+    $ref: /schemas/types.yaml#/definitions/uint32-matrix
     description: |
       Two cells are required, first cell specifies minimum slot voltage (mV),
       second cell specifies maximum slot voltage (mV).
     items:
-      - description: |
-          value for minimum slot voltage in mV
-        default: 3200
-      - description: |
-          value for maximum slot voltage in mV
-        default: 3400
+      items:
+        - description: |
+            value for minimum slot voltage in mV
+          default: 3200
+        - description: |
+            value for maximum slot voltage in mV
+          default: 3400
+    maxItems: 1
 
   gpios:
     description: |