Revert "RWSEM backport related"

This reverts commit 5762902c91f08f8e80e3208213fa9b69dc8eb41f.
Revert "rwsem: Optimized ARM RWSEM algorithm and backported from 3.4 kernel"

This reverts commit 3ae67c488d9f0f285aea1fe0d3774df5806a680c.