feat(ansible): update 1n-tx2 config

Arm VPP Device requires newer drivers, otherwise we're frequently seeing
a deadlock when running csit-initialize-vfs.

We've observed server slowdown in VPP Device jobs in the past and
testing revealed that disabling the cppc_cpufreq seemingly resolves the
issue (there was no observed slowdown with a sample of 500 job runs).

Also update Nomad config (server IPs).

Change-Id: I484417f2cdb701239ca7517406147d0f2f7adde4
Signed-off-by: Juraj Linkeš <juraj.linkes@pantheon.tech>