net/bnxt: combine default and regular flows

net/bnxt: combine default and regular flows

The default and regular flows are stored in the same flow table
instead of different flow tables. This should help code reuse
and reducing the number of allocations.
So combine default and regular flows in flow database.

Signed-off-by: Kishore Padmanabha <kishore.padmanabha@broadcom.com>
Reviewed-by: Mike Baucom <michael.baucom@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>