Revert "lib/string: use glibc version"

This reverts commit 3da765af05b13a1f99d88fc8837d74c45658e92d.
Revert "timekeeping: fix 32-bit overflow in get_monotonic_boottime"

This reverts commit ebd5263aa5348b9f7e05e4ccf6bc83038585b042.
Revert "sync: don't block the flusher thread waiting on IO"

This reverts commit 7e053e45227859e0f534a921521d21cab9cc0386.
Revert "ext4: Speed up FITRIM by recording flags in ext4_group_info"

This reverts commit ee2804c0c138e77f0d5f81e9dbae728b7b02d0f7.
Revert " ARM: keep __my_cpu_offset consistent with generic one"

This reverts commit 7058d47890b85782991be034f81ed5f7a435148c.
Revert " ARM: implement optimized percpu variable access"

This reverts commit 143c3f97587419eb307e8bf69adcc8ec9c712a15.
Revert "ARM: 7746/1: mm: lazy cache flushing on non-mapped pages"

This reverts commit 0ddc22e2c07cb9ba142c24bbbad0303ede766627.
Revert " mm: change initial readahead window size calculation"

This reverts commit 74ad34b27dc06b00f8d4d86fe421ea234edeae07.
Revert "lib/sha1: use the git implementation of SHA-1"

This reverts commit c83602690b7de841742e8e6ff9f97b3cc9922165.
Revert "Remove ARM sha1 routines"

This reverts commit c9e98ccc7a18018c9ed397e62bc5fc2c746e1d0e.
Revert "lib/memcopy: use glibc version"

This reverts commit 80171ce87b15ea360613ff0becb35156c387b25b.
Revert "ashmem: avoid deadlock between read and mmap calls"

This reverts commit 35fb1b62ca4326bfca9f5ae004795a732f1722be.