[Arm64) Revert A53 detection as A57
[Arm64) Revert A53 detection as A57

This patch reverts the decision of treating A53 like A57, which was
based on an analysis done on server class hardware and is not
representative of all A53s out there.

Fixes #1855.

xianyi/OpenBLAS,xianyi/OpenBLAS,xianyi/OpenBLAS,xianyi/OpenBLAS,xianyi/OpenBLAS,xianyi/OpenBLAS,xianyi/OpenBLAS,xianyi/OpenBLAS