bnxt_en: Use event bit map in RX path.

bnxt_en: Use event bit map in RX path.

Orabug: 25645429

In the current code, we have separate rx_event and agg_event parameters
to keep track of rx and aggregation events.  Combine these events into
an u8 event mask with different bits defined for different events.  This
way, it is easier to expand the logic to include XDP tx events.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 4e5dbbda4c40a239e2ed4bbc98f2aa320e4dcca2)
Signed-off-by: Brian Maly <brian.maly@oracle.com>