Clearfog: cleanup

For some reason, `make savedefconfig` says that this is not needed.

Change-Id: I5efd438a685a5070811eee7e06ea984952c17c65
diff --git a/configs/czechlight_clearfog_defconfig b/configs/czechlight_clearfog_defconfig
index 4f045fc..8e6d152 100644
--- a/configs/czechlight_clearfog_defconfig
+++ b/configs/czechlight_clearfog_defconfig
@@ -68,5 +68,4 @@
 BR2_PACKAGE_HOST_DOSFSTOOLS=y
 BR2_PACKAGE_HOST_GENIMAGE=y
 BR2_PACKAGE_HOST_RAUC=y
-BR2_PACKAGE_HOST_SQUASHFS=y
 CZECHLIGHT_NETCONF=y