Revert "DefConfig update for Dynamic_fsync"

This reverts commit be9795f3db1f0fd5070030583b5fafc27f095e2b.
Revert "Dynamic Fsync by default"

This reverts commit 5b282deb8911bd40f8aadb4901b5e17b3e368268.
Revert "dynamic fsync: don't disable fdatasync()"

This reverts commit 8ad9fdaa41b5f19b2d9c3150c6354bd142d5e042.
Revert "dynamic fsync: favor true case since most will be using this feature"

This reverts commit 8a2c5845b602fc57511f6392d3e74a6516c2a5e1.
Revert "dynamic filesync: add some cache optimizations"

This reverts commit 5bd69394e325cea4c844acd9566b50bd5ae4e976.
Revert "fs/dyn_fsync: check dyn fsync control's active prior to performing fsync ops"

This reverts commit 46101d1e8eaafa2d1a4b02a92175c0b98f71576d.
Revert "fs/dyn_sync_cntrl: dynamic sync control"

This reverts commit 11bac659bfe28fae84a9ee2c99109da0b5b76c1c.
Revert "fs: push i_mutex and filemap_write_and_wait down into"

This reverts commit b85aedf71ad56b653bd60f405c2b4fdd47055835.
Revert "switch do_fsync() to fget_light()"

This reverts commit 4f1b3bfd1d7a5b39d7571bbc221ef027a98aec79.