Check for missing MSI-x and Tx completions in ENA

Check for missing MSI-x and Tx completions in ENA

If the first MSI-x won't be executed, then the timer service will detect
that and trigger device reset.

The checking for missing Tx completion was reworked, so it will also
check for missing interrupts. Checking number of missing Tx completions
can be performed after loop, instead of checking it every iteration.

Submitted by:  Michal Krawczyk <mk@semihalf.com>
Obtained from: Semihalf
Sponsored by:  Amazon, Inc.