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

This reverts commit ea25ca528337333b9e5539c47d5fcd7a23bfd990.
Revert "ARM: 7668/1: fix memset-related crashes caused by recent GCC (4.7.2) optimizations"

This reverts commit ee567d2149cdaded952330ecd3158d9dfd3ed240.