[MTD] OneNAND/Kconfig: Fix dependencies

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

drivers/mtd/onenand/Kconfig

@@ -24,11 +24,10 @@ config MTD_ONENAND_VERIFY_WRITE
 	  flipped accidentaly due to device wear or something else.
 
 config MTD_ONENAND_GENERIC
-	tristate "OneNAND Flash device on generic board"
-	depends on MTD_ONENAND
+	tristate "OneNAND Flash device via platform device driver"
+	depends on MTD_ONENAND && ARM
 	help
-	  Support for OneNAND flash on generic board. Using device driver
-	  framework, now all most platfrom are support.
+	  Support for OneNAND flash via platform device driver.
 
 config MTD_ONENAND_SYNC_READ
 	bool "OneNAND Sync. Burst Read Support"