gflt200: enabled gpio sysfs.

Change-Id: Ib7b345cc629db94d18d5f44263c3e2d856f0c8d4
diff --git a/arch/arm/configs/gflt200_defconfig b/arch/arm/configs/gflt200_defconfig
index 9306a95..e4da19f 100644
--- a/arch/arm/configs/gflt200_defconfig
+++ b/arch/arm/configs/gflt200_defconfig
@@ -1127,7 +1127,7 @@
 # CONFIG_PPS is not set
 CONFIG_ARCH_REQUIRE_GPIOLIB=y
 CONFIG_GPIOLIB=y
-# CONFIG_GPIO_SYSFS is not set
+CONFIG_GPIO_SYSFS=y
 
 #
 # Memory mapped GPIO expanders: