kvm tools: Set hardcoded MAC to local administered

This sets bit one in the first octet to 1, which means that the hardcoded
MAC we use is locally administered and wasn't assigned to us.

Acked-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>