Merge branch 'ena-capabilities-field-and-cosmetic-changes'

Arthur Kiyanovski says:

====================
ENA: capabilities field and cosmetic changes

Add a new capabilities bitmask field to get indication of
capabilities supported by the device. Use the capabilities
field to query the device for ENI stats support.

Other patches are cosmetic changes like fixing readme
mistakes, removing unused variables etc...
====================

Link: https://lore.kernel.org/r/20220107202346.3522-1-akiyano@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>