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: Simon Glass <sjg@chromium.org>
Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>

drivers/spi/soft_spi_legacy.c

@@ -42,11 +42,6 @@ static inline struct soft_spi_slave *to_soft_spi(struct spi_slave *slave)
  */
 void spi_init (void)
 {
-#ifdef	SPI_INIT
-	volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
-
-	SPI_INIT;
-#endif
 }
 
 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,