Revert "Squash 'enhance power efficiency' patches"

This is for armv8, so useless here.

This reverts commit f19bd7a6dd8d51952e1bd8cc7f2b4cddb8fd5908.
Revert "ARM: 7493/1: use generic unaligned.h"

This reverts commit 8dac0c5b6d0be3c96a6509453064e336c3dd1a0c.