[Yaffs] Changing the names of yaffs symbols

Hello All

As has been announced before, CELF and Google are funding a drive to get yaffs
mainlined in the Linux kernel.

One part of this effort is to change yaffs symbol names to be Linux kernel
friendly. eg: yaffs_ScanBackwards changes to yaffs_scan_backwards

I shall be checking in a whole slew of name changes in a few days time
(probably my Monday, 10th).

If anyone has patches they would like to submit it might be a good idea to
try get those in before the name changes.

-- Charles