dt-bindings: mmc: renesas,sdhi: add top-level constraints

Properties with variable number of items per each device are expected to
have widest constraints in top-level "properties:" block and further
customized (narrowed) in "if:then:".  Add missing top-level constraints
for clocks.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20240818172923.121867-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml

@@ -76,9 +76,13 @@ properties:
     minItems: 1
     maxItems: 3
 
-  clocks: true
+  clocks:
+    minItems: 1
+    maxItems: 4
 
-  clock-names: true
+  clock-names:
+    minItems: 1
+    maxItems: 4
 
   dmas:
     minItems: 4