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.com


Signed-off-by: Mark Brown <broonie@kernel.org>