Revert "ashmem: avoid deadlock between read and mmap calls"

This reverts commit 014349eba2f0dbe9c6a9f1f8290d6ed293509ff1.
Revert "staging: android: ashmem: get_name,set_name not to hold ashmem_mutex"

This reverts commit 5aa75c2b5e40d0f7c6644c0d07596a4262e97ef9.
Revert "staging: android: ashmem: Avoid deadlock with mmap/shrink"

This reverts commit 54e9f0d16941f2bf373bd43fa41be1c61b17db77.