Update ENA driver version to v2.2.0

Driver version upgrade is connected with support for the new device
fetures, like Tx drops reporting or disabling meta caching.

Moreover, the driver configuration from the sysctl was reworked to
provide safer and better flow for configuring:

• number of IO queues (new feature),
• drbr size on Tx,
• Rx queue size.

Moreover, a lot of minor bug fixes and improvements were added.

Copyright date in the license of the modified files in this release was
updated to 2020.

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