dt-bindings: spi: fsl-imx-cspi: Document missing entries

The imx25, imx50, imx51 and imx53 SPIs are compatible with the imx35.

Document them accordingly.
Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230924183904.752415-1-festevam@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/spi/fsl-imx-cspi.yaml

@@ -22,6 +22,13 @@ properties:
       - const: fsl,imx35-cspi
       - const: fsl,imx51-ecspi
       - const: fsl,imx53-ecspi
+      - items:
+          - enum:
+              - fsl,imx25-cspi
+              - fsl,imx50-cspi
+              - fsl,imx51-cspi
+              - fsl,imx53-cspi
+          - const: fsl,imx35-cspi
       - items:
           - const: fsl,imx8mp-ecspi
           - const: fsl,imx6ul-ecspi