Images for Clearfog Base

This is based on what I submitted upstream at
https://patchwork.ozlabs.org/patch/809838/ (which hasn't been merged
yet).

Change-Id: I6466ddfb10962d1d85f98aa4d45232f737f010e0
diff --git a/board/czechlight/clearfog/post-build.sh b/board/czechlight/clearfog/post-build.sh
new file mode 100755
index 0000000..ff22ebd
--- /dev/null
+++ b/board/czechlight/clearfog/post-build.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+install -m 0644 -D $BINARIES_DIR/boot.scr $TARGET_DIR/boot/boot.scr