omap3: fix NAND support for mcx board

mcx was not updated according to changes in
NAND driver.
Signed-off-by: NStefano Babic <sbabic@denx.de>
Reviewed-by: NTom Rini <trini@konsulko.com>

include/configs/mcx.h

@@ -309,7 +309,10 @@
  */
 
 /* **** PISMO SUPPORT *** */
+#define CONFIG_NAND
+#define CONFIG_SYS_NAND_BUSWIDTH_16BIT
 #define CONFIG_NAND_OMAP_GPMC
+#define CONFIG_NAND_OMAP_GPMC_PREFETCH
 #define CONFIG_ENV_IS_IN_NAND
 #define SMNAND_ENV_OFFSET		0x180000 /* environment starts here */