omap: cleanup NAND platform data

omap_nand_platform_data fields 'options', 'gpio_irq', 'nand_setup' and
'dma_channel' are never referenced by the NAND driver, yet various
board files are initializing those fields. This is both incorrect and
confusing, so remove them. This allows to get rid of a global
variable in gpmc-nand.c.

This also corrects an issue where some boards are trying to pass NAND
16bit flag through .options, but the driver is using .devsize instead
and ignoring .options.

Finally, .dev_ready is treated as a flag by the driver, so make it bool
instead of a function pointer.

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/plat-omap/include/plat/nand.h b/arch/arm/plat-omap/include/plat/nand.h
index d86d1ec..67fc506 100644
--- a/arch/arm/plat-omap/include/plat/nand.h
+++ b/arch/arm/plat-omap/include/plat/nand.h
@@ -19,15 +19,11 @@
 };
 
 struct omap_nand_platform_data {
-	unsigned int		options;
 	int			cs;
-	int			gpio_irq;
 	struct mtd_partition	*parts;
 	struct gpmc_timings	*gpmc_t;
 	int			nr_parts;
-	int			(*nand_setup)(void);
-	int			(*dev_ready)(struct omap_nand_platform_data *);
-	int			dma_channel;
+	bool			dev_ready;
 	int			gpmc_irq;
 	enum nand_io		xfer_type;
 	unsigned long		phys_base;