[baremetal] Fix: wrong nic name idf index

[baremetal] Fix: wrong nic name idf index

This was only affecting pod deployments with
different board models, under the current limited
support:
- 3 KVMs will be same model and have the same NIC names
- 2 Compute nodes will be the same model and have same NIC names

For the computes nodes, br-mesh NIC name was wrong due
to incorrect idf mapping

Change-Id: I9685b35cb23b03be9fc0e6fe16c0712a9ad70e19
Signed-off-by: Guillermo Herrero <guillermo.herrero@enea.com>
(cherry picked from commit 378b4a72c27c941d5e37216edb23f224fbb58e26)