Revert some changes that could bring instability.

Revert "ARM: 7670/1: fix the memset fix"

This reverts commit 1f15297b620ebc582f08ba9a76a88173b0416df8.

Change-Id: I99101001081c779527e43f0cabb5f49b0ac88176

Revert "ARM: 7668/1: fix memset-related crashes caused by recent GCC (4.7.2) optimizations"

This reverts commit 98f6322af7faa989e7ebda603422bb06198e7664.

Revert "Fix security_binder_transfer_binder hook."

This reverts commit f21fb3a9e8f9f15a19927382ef69b274de48eff5.

Revert "Do not apply permission checks to private files."

This reverts commit 59914c7f6e1ed5ac5360ea4711b97266c644064f.

Revert "Add permission checking for binder IPC."

This reverts commit c475c2b205b949a9fcd0c10cc2b7ae048bdd5d0e.