UBUNTU: SAUCE: net: ena: fix too long default tx interrupt moderation interval

UBUNTU: SAUCE: net: ena: fix too long default tx interrupt moderation interval

BugLink: https://bugs.launchpad.net/bugs/1853180
Current default non-adaptive tx interrupt moderation interval is 196 us.
This commit sets it to 0, which is much more sensible as a default value.
It can be modified using ethtool -C.

Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Reference: https://lore.kernel.org/netdev/1572868728-5211-1-git-send-email-akiyano@amazon.com/
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>