Revert "fs: yaffs2: Revert to older version"

This reverts commit 4c3fda289a8bbb46d4b31867085383ae808d867d.

Testing has shown this change is not necessary on the current
tip.

(cherry picked from commit d5f0c84df23717a67775a4f43f081694a8528708)

Orig-Change-Id: Ic4e93f809eecb9e4cd0c06469da68942a5a79071
Signed-off-by: Michael Bohan <mbohan@codeaurora.org>

Change-Id: If72e7eb8b9548d37b92d9f2b9109301262e67007