u-boot: Update yaffs2 file system

This patch updates the yaffs2 in u-boot to correspond to
git://www.aleph1.co.uk/yaffs2
commit id 9ee5d0643e559568dbe62215f76e0a7bd5a63d93

Signed-off-by: Charles Manning <cdhmanning@gmail.com>

Coding Style cleanup, update CHANGELOG

Signed-off-by: Wolfgang Denk <wd@denx.de>

moving files from yaffs2/direct/ to yaffs2/ and deleting all symlinks

Signed-off-by: William Juul <william.juul@tandberg.com>