This reverts commit 7adaec468d.
It does not seem to fix the issue it was supposed to fix.
Additionally it breaks code which decides in full/partial update,
because it manipulates timestamp that code is relying on.
(From OE-Core rev: ebc65fdddd7ce51f0f1008baa30d0ae7918ae0bb)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>