This adds support for accessing bootfs JFFS2 partition in the BCM4908
image. Support includes:
1. Listing files
2. Renaming file (requires unchanged name length)
Above commands are useful for flashing BCM4908 images which by defualt
come with cferom.000 file and require renaming it.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit ed847ef5f3)