blackfin: Remove GENERIC_GPIO config option again

The Kconfig symbol GENERIC_GPIO was removed in v3.10. Nothing cares
about it anymore. It popped up somehow in v3.13, so it can be removed
again.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index f936ee6..5ae0aa7 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -52,9 +52,6 @@
 config ZONE_DMA
 	def_bool y
 
-config GENERIC_GPIO
-	def_bool y
-
 config FORCE_MAX_ZONEORDER
 	int
 	default "14"