spi_mpc83xx: rework chip selects handling

The main purpose of this patch is to pass 'struct spi_device' to the chip
select handling routines.  This is needed so that we could implement
full-fledged OpenFirmware support for this driver.

While at it, also:
- Replace two {de,activate}_cs routines by single cs_contol().
- Don't duplicate platform data callbacks in mpc83xx_spi struct.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Cc: David Brownell <david-b@pacbell.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Kumar Gala <galak@gate.crashing.org>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/powerpc/sysdev/fsl_soc.h

@@ -4,6 +4,8 @@
 
 #include <asm/mmu.h>
 
+struct spi_device;
+
 extern phys_addr_t get_immrbase(void);
 #if defined(CONFIG_CPM2) || defined(CONFIG_QUICC_ENGINE) || defined(CONFIG_8xx)
 extern u32 get_brgfreq(void);
@@ -19,8 +21,7 @@ struct device_node;
 
 extern int fsl_spi_init(struct spi_board_info *board_infos,
 			unsigned int num_board_infos,
-			void (*activate_cs)(u8 cs, u8 polarity),
-			void (*deactivate_cs)(u8 cs, u8 polarity));
+			void (*cs_control)(struct spi_device *spi, bool on));
 
 extern void fsl_rstcr_restart(char *cmd);