spi: Remove used spi_init

spi_init used in some areas in tree, but the respective
drivers will remove in future patches.

So remove the same instances.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>

common/board_f.c

@@ -23,7 +23,6 @@
 #include <os.h>
 #include <post.h>
 #include <relocate.h>
-#include <spi.h>
 #include <status_led.h>
 #include <sysreset.h>
 #include <timer.h>
@@ -262,7 +261,6 @@ __weak int init_func_vid(void)
 static int init_func_spi(void)
 {
 	puts("SPI:   ");
-	spi_init();
 	puts("ready\n");
 	return 0;
 }

doc/driver-model/spi-howto.txt

@@ -163,11 +163,6 @@ At this point you should be able to build U-Boot for your board with the
 empty SPI driver. You still have empty methods in your driver, but we will
 write these one by one.
 
-If you have spi_init() functions or the like that are called from your
-board then the build will fail. Remove these calls and make a note of the
-init that needs to be done.
-
-
 7. Set up your platform data structure
 
 This will hold the information your driver to operate, like its hardware

examples/standalone/atmel_df_pow2.c

@@ -126,8 +126,6 @@ int atmel_df_pow2(int argc, char * const argv[])
 		return 1;
 	}
 
-	spi_init();
-
 	while (1) {
 		struct spi_slave *slave;
 		char *line, *p;

include/_exports.h

@@ -50,11 +50,9 @@
 #endif
 
 #if !defined(CONFIG_CMD_SPI) || defined(CONFIG_DM_SPI)
-	EXPORT_FUNC(dummy, void, spi_init, void)
 	EXPORT_FUNC(dummy, void, spi_setup_slave, void)
 	EXPORT_FUNC(dummy, void, spi_free_slave, void)
 #else
-	EXPORT_FUNC(spi_init, void, spi_init, void)
 	EXPORT_FUNC(spi_setup_slave, struct spi_slave *, spi_setup_slave,
 		    unsigned int, unsigned int, unsigned int, unsigned int)
 	EXPORT_FUNC(spi_free_slave, void, spi_free_slave, struct spi_slave *)