spi: ich: Use compatible strings to distinguish controller version
At present ich spi driver gets the controller version information via pch, but this can be simply retrieved via spi node's compatible string. Signed-off-by: NBin Meng <bmeng.cn@gmail.com> Reviewed-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NJagan Teki <jteki@openedev.com> Tested-by: NSimon Glass <sjg@chromium.org>
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