Revert "fs: Remove missed ->fds_bits from cessation use of fd_set structs internally"

This reverts commit e7d8522d2ab91f6a505e0ad2b7345cbdff4775a1.

Reverting because this commit fixes/references a 3.4 kernel commit (1fd36ad)
which does not exits in 3.0.
Revert "Wrap accesses to the fd_sets in struct fdtable"

This reverts commit b8788928d8ab7ff317979883aac2eca01ff66d62.

Reverting because this commit is not needed for the 3.4 android binder to work.