Update ENA driver version to v2.3.0

The v2.3.0 introduces new ena_com layer, ENI metrics updates and SPDX
license tags.

Submitted by: Michal Krawczyk <mk@semihalf.com>
Obtained from: Semihalf
Sponsored by: Amazon, Inc
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D27120