mtd/maps: gpio-addr-flash: depend on GPIO arch support

The driver requires gpio functionality, so make sure we depend on that in
the Kconfig menu.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
index 3a9a960..0fc67a2 100644
--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -486,6 +486,7 @@
 
 config MTD_GPIO_ADDR
 	tristate "GPIO-assisted Flash Chip Support"
+	depends on GENERIC_GPIO || GPIOLIB
 	depends on MTD_COMPLEX_MAPPINGS
 	select MTD_PARTITIONS
 	help