net/bnxt: support NAT for dest IP and port combination

net/bnxt: support NAT for dest IP and port combination

* Added support for NAT action for destination IP and port
  combination for Thor devices.
* Consolidated the encapsulation and NAT entries for scaling flows
  with NAT actions.

Signed-off-by: Kishore Padmanabha <kishore.padmanabha@broadcom.com>
Signed-off-by: Venkat Duvvuru <venkatkumar.duvvuru@broadcom.com>
Reviewed-by: Shahaji Bhosle <sbhosle@broadcom.com>
Reviewed-by: Mike Baucom <michael.baucom@broadcom.com>
Reviewed-by: Randy Schacher <stuart.schacher@broadcom.com>
Acked-by: Ajit Khaparde <ajit.khaparde@broadcom.com>