[committed buildbot patch] Replace the aarch64 build slave

[Tulio Magno Quites Machado Filho]

Szabolcs Nagy <szabolcs.nagy@arm.com> writes:

> This one is a thunderx machine.
>
> (the other one was down for a while now.)
>
> i assume the slave will be able to connect once there is a server restart.

The server has just been restarted.

If the new slave doesn't reconnect in the following minutes, we'll have to
analyze its log.

Thanks!

-- 
Tulio Magno