unicore32: default GENERIC_GPIO to false

GPIO implementation for unicore32 uses gpiolib, which sets GENERIC_GPIO
when selected.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/arch/unicore32/Kconfig b/arch/unicore32/Kconfig
index 70f8c8e..63521dc 100644
--- a/arch/unicore32/Kconfig
+++ b/arch/unicore32/Kconfig
@@ -24,7 +24,7 @@
 	  Please see web page at <http://www.pkunity.com/>.
 
 config GENERIC_GPIO
-	def_bool y
+	bool
 
 config GENERIC_CSUM
 	def_bool y