fio: Add PACKAGECONFIG for numa, re-enable ARM build

Make fio's NUMA support optional via PACKAGECONFIG.
Enable this feature by default, except on ARM where libnuma/numactl
is not available.

Signed-off-by: Dominic Sacré <dominic.sacre@gmx.de>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>