spi: qcom-qspi: Add minItems to interconnect-names

Add minItems constraint to interconnect-names as well. The schema
currently tries to match 2 names and fail for DTs with single entry.

With the change applied, below interconnect-names values are possible:
['qspi-config'], ['qspi-config', 'qspi-memory']

Fixes: 8f9c2915 ("dt-bindings: spi: Add interconnect binding for QSPI")
Signed-off-by: Kuldeep Singh <singh.kuldeep87k@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220328192006.18523-1-singh.kuldeep87k@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.yaml

@@ -49,6 +49,7 @@ properties:
     maxItems: 2
 
   interconnect-names:
+    minItems: 1
     items:
       - const: qspi-config
       - const: qspi-memory