dm: spi: Remove SPI_INIT feature
This feature provides for init of a single SPI port for the soft SPI feature. It is not really compatible with driver model since it assumes a single SPI port. Also, inserting SPI init into the driver by means of a #define is not very nice. This feature is not used by any active boards, so let's remove it. Signed-off-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NJagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
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