dt-bindings: mmc: marvell,xenon-sdhci: Drop requiring 2 clocks

The "axi" clock is optional on at least the "marvell,armada-ap806-sdhci"
variant. Not sure what's correct here, so just drop the constraint.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250320-dt-marvell-mmc-v1-3-e51002ea0238@kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.yaml

@@ -169,26 +169,6 @@ allOf:
 
         marvell,pad-type: false
 
-  - if:
-      properties:
-        compatible:
-          contains:
-            enum:
-              - marvell,armada-cp110-sdhci
-              - marvell,armada-ap807-sdhci
-              - marvell,armada-ap806-sdhci
-
-    then:
-      properties:
-        clocks:
-          minItems: 2
-
-        clock-names:
-          items:
-            - const: core
-            - const: axi
-
-
 required:
   - compatible
   - reg