arch.py: Added Aarch64 and Cortex-A53 support
arch.py: Added Aarch64 and Cortex-A53 support

Signed-off-by: Sean Nyekjaer <d7e19930cc1f42c2d0781f4d9e6f1fe5891bf9cf@nyekjaer.dk>

sknsean/core,sknsean/core,sknsean/core,sknsean/core,sknsean/core