trivial: mtd: fix Kconfig comment about 'armflash'

The real 'armflash' map driver is selected by CONFIG_MTD_ARM_INTEGRATOR
Signed-off-by: Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/mtd/Kconfig

@@ -154,7 +154,8 @@ config MTD_AFS_PARTS
 
 	  You will still need the parsing functions to be called by the driver
 	  for your particular device. It won't happen automatically. The
-	  'armflash' map driver (CONFIG_MTD_ARMFLASH) does this, for example.
+	  'armflash' map driver (CONFIG_MTD_ARM_INTEGRATOR) does this, for
+	  example.
 
 config MTD_OF_PARTS
 	tristate "Flash partition map based on OF description"