clearfog: Support updating with RAUC

This needs a few changes to the host:

- `mke2fs` is required to re-create the filesystem
- `unsquashfs` is needed for working `rauc info`

Change-Id: I036304286db3fb456c366c65704923f5d7321917
diff --git a/configs/czechlight_clearfog_defconfig b/configs/czechlight_clearfog_defconfig
index 54ac972..103a262 100644
--- a/configs/czechlight_clearfog_defconfig
+++ b/configs/czechlight_clearfog_defconfig
@@ -25,6 +25,8 @@
 BR2_LINUX_KERNEL_INSTALL_TARGET=y
 BR2_PACKAGE_LINUX_TOOLS_PERF=y
 BR2_PACKAGE_BUSYBOX_CONFIG_FRAGMENT_FILES="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/common/busybox-config"
+BR2_PACKAGE_E2FSPROGS=y
+BR2_PACKAGE_SQUASHFS=y
 BR2_PACKAGE_I2C_TOOLS=y
 BR2_PACKAGE_UBOOT_TOOLS=y
 BR2_PACKAGE_OPENSSH=y