dt-bindings: soc: imx: drop minItems for i.MX8MM vpu blk ctrl

minItems and maxItems are set as the same value. In such case minItems is
not necessary. So drop it.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Documentation/devicetree/bindings/soc/imx/fsl,imx8mm-vpu-blk-ctrl.yaml

@@ -27,7 +27,6 @@ properties:
     const: 1
 
   power-domains:
-    minItems: 4
     maxItems: 4
 
   power-domain-names:
@@ -38,7 +37,6 @@ properties:
       - const: h1
 
   clocks:
-    minItems: 3
     maxItems: 3
 
   clock-names: