net/bnxt: fix crash caused by error recovery

net/bnxt: fix crash caused by error recovery

bnxt_stop_rxtx() does not stop data path processing as intended
as it does not update the recently introduced fast-path pointers
'(struct rte_eth_fp_ops)->rx_pkt_burst'. Since both the burst routines
only use the fast-path pointer, the real burst routines get invoked
instead of the dummy ones set by bnxt_stop_rxtx() leading to crashes
in the data path (e.g. dereferencing freed structures)

Fix the segfault by updating the fast-path pointer as well

Fixes: c87d435a4d79 ("ethdev: copy fast-path API into separate structure")
Signed-off-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>