It's helpful for accessing booting data (DTS, kernel, etc.). It has to
be used carefully as CFE's JFFS2 support is quite dumb. It doesn't
recognize deleted files and has problems handling 0 inode.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 6dd727ac24fa36ac3f23e9a5cf6781a7d1c6b797)