[MTD] NAND: Fix typo in mtd/nand/ts7250.c

I was unable to compile ts7250.c after your refactor commit,
it's a typo probably.

-- ynezz

From: Petr Stetiar <ynezz@true.cz>
Signed-off-by: Thomas Gleixner  <tglx@linutronix.de>

drivers/mtd/nand/ts7250.c

@@ -97,7 +97,7 @@ static void ts7250_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 		unsigned long addr = TS72XX_NAND_CONTROL_VIRT_BASE;
 		unsigned char bits;
 
-		bits = (ctrl & NAND_CNE) << 2;
+		bits = (ctrl & NAND_NCE) << 2;
 		bits |= ctrl & NAND_CLE;
 		bits |= (ctrl & NAND_ALE) >> 2;