ena: Improve reset reason statistics

[osamaabb_amazon.com]

Summary

The driver uses different reset reasons.
Some of them are counted and presented in the driver statistics.
There are cases where statistics are counted on a ring level,
but these are zeroed after a reset procedure takes place.

This commit makes the following changes:

1. Add statistics for the unrepresented reset reasons.
2. Add reset reasons which are counted on a ring level,

to be also global for better tracking.

Approved by: cperciva
MFC after: 2 weeks
Sponsored by: Amazon, Inc.

[cperciva]

sys/dev/ena/ena.c

3017

I'm not clear on why this (and the similar increment of admin_q_pause) are going away.

[osamaabb_amazon.com]

sys/dev/ena/ena.c

3017

With this commit, these incrementations are being done in ena_trigger_reset() now
We send the reset reason there and increment the relevant statistic including admin_q_pause and wd_expired