Revert "Asynchronous Fsync: initial extraction of Async Fsync from HTC"

This reverts commit 45381d76b63a26f27aaa88aacf90ddb52a2bda0f.
Revert "defconfig: added async fsync config"

This reverts commit ab3345c49c1be4ee1a73c2124e3ace1652cfbef4.