maintainers: update for ena
maintainers: update for ena

Add Igor Chauskin from the Amazon as another maintainer of the driver.
Igor is another person from the Amazon team that is responsible for the
ENA DPDK driver.

Signed-off-by: Michal Krawczyk <a91dcbb4df49d8bfe0a9930d7ff911a4292ca1f5@semihalf.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk