MFC: a63eae6
Revert 2d4422e7991a, Eliminate lock order reversal in UFS ffs_unmount().
After discussion with Chuck Silvers (chs@) we have decided that
there is a better way to resolve this lock order reversal which
will be committed separately.
Sponsored by: Netflix
(cherry picked from commit a63eae65ff8789994c40573a0aa65128022c8bf2)