[MTD] [NAND] fix OOPS accessing flash operations over STM flash on PXA

STM 2Gb flash is a large-page NAND flash.  Set operations accordingly.
This field is dereferenced without a check in several places resulting in
OOPS.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Eric Miao <ymiao3@marvell.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/nand/pxa3xx_nand.c

@@ -269,6 +269,7 @@ static struct pxa3xx_nand_timing stm2GbX16_timing = {
 
 static struct pxa3xx_nand_flash stm2GbX16 = {
 	.timing = &stm2GbX16_timing,
+	.cmdset	= &largepage_cmdset,
 	.page_per_block = 64,
 	.page_size = 2048,
 	.flash_width = 16,