clearfog: Fix busybox' config

Change-Id: I19c158037847a84095c4132e3ba2fcf7d050ec52
diff --git a/configs/czechlight_clearfog_defconfig b/configs/czechlight_clearfog_defconfig
index 9c93dfd..05a738b 100644
--- a/configs/czechlight_clearfog_defconfig
+++ b/configs/czechlight_clearfog_defconfig
@@ -24,6 +24,7 @@
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
 BR2_LINUX_KERNEL_INTREE_DTS_NAME="armada-388-clearfog-base"
 BR2_LINUX_KERNEL_INSTALL_TARGET=y
+BR2_PACKAGE_BUSYBOX_CONFIG_FRAGMENT_FILES="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/common/busybox-config"
 BR2_PACKAGE_UBOOT_TOOLS=y
 BR2_TARGET_ROOTFS_EXT2=y
 BR2_TARGET_ROOTFS_EXT2_4=y