Revert "vitio::net: Disable preemption when in BHes"

This reverts commit 7e2daefb66489e6f5a886559fd849e809535a8d1.

Let's put it aside for a meanwhile.
net: added wakeup statistics

These new statistics count the number of wakeups that handled more than X packets.

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>