Revert "Build fix (perhaps)"

This reverts commit 82cdd9cdbeaff84d8356490f1474f724ea8d486f.
Revert "F2FS backport test"

This reverts commit b7a7cff024b0283c0aed7a4763f389e931ad06cf.
update defconfig
Revert "fix for app-mounted directories (thanks @mkasick)"

This reverts commit 741cf8a39ae5dfaafcac1c9ce1df290b935e124d.
update defconfig