examples/vm_power: fix build without i40e
examples/vm_power: fix build without i40e

channel_monitor.c was dependent on i40e driver being available.
This is only necessary for the TRAFFIC policy, so use #ifdef's
to not call these when i40e not available.

Fixes: f14791a8126e ("examples/vm_power_mgr: add policy to channels")
Cc: stable@dpdk.org

Signed-off-by: David Hunt <763be7c8e0ad91e03160e7aed76d5cd41534e2f9@intel.com>
Tested-by: Bruce Richardson <66b9e8e8fbd5e9f41f91b0af050876182ce9d0e4@intel.com>
Acked-by: Bruce Richardson <66b9e8e8fbd5e9f41f91b0af050876182ce9d0e4@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk