MAINTAINERS: Update ENA maintainers information

The ENA driver is no longer maintained by Netanel and Guy

Signed-off-by: Shay Agroskin <shayagr@amazon.com>
Link: https://lore.kernel.org/r/20211102110358.193920-1-shayagr@amazon.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>