ralink: add missing CONFIG_ symbol to mt7620n

Signed-off-by: John Crispin <[email protected]>

SVN-Revision: 38867

target/linux/ramips/mt7620n/config-3.10

@@ -96,6 +96,7 @@ CONFIG_MODULES_USE_ELF_REL=y
 # CONFIG_MTD_CFI_INTELEXT is not set
 CONFIG_MTD_CMDLINE_PARTS=y
 CONFIG_MTD_M25P80=y
+# CONFIG_MTD_NAND_MT7620 is not set
 CONFIG_MTD_OF_PARTS=y
 CONFIG_MTD_PHYSMAP=y
 CONFIG_MTD_PHYSMAP_OF=y