mtd: nand: omap: Fix comment in platform data using wrong Kconfig symbol

The symbol that is being used in the #if/#endif block is not the one
which is mentioned at the bottom.

Fixes: 93af53b8 ("nand: omap2: Remove horrible ifdefs to fix module probe")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

include/linux/platform_data/elm.h

@@ -60,6 +60,6 @@ static inline int elm_config(struct device *dev, enum bch_ecc bch_type,
 {
 	return -ENOSYS;
 }
-#endif /* CONFIG_MTD_NAND_ECC_BCH */
+#endif /* CONFIG_MTD_NAND_OMAP_BCH */
 
 #endif /* __ELM_H */