Allow the data in the first buffer to be shifted by `pkt_offset` after
the header room. The offset value is provided by `ena_rx_ctx`.
As part of this update, the version of the ENA was upgraded to v2.0.3.
Signed-off-by: Maciej Bielski <mba@semihalf.com>
Acked-by: Michal Krawczyk <mk@semihalf.com>