Revert "switch the protection of percpu_counter list to spinlock"

This reverts commit c4f86ba5837fcffa6eb2569853f5a625bde0fe20.
Revert "ARM: 7493/1: use generic unaligned.h"

This reverts commit b95e1e15dbe2ffd3e8d406c2d2a8720ef0c8d37b.