net/bnxt: add hashing changes for Thor

net/bnxt: add hashing changes for Thor

- Move HCAPI hashing code to common file and add Thor support.
- Change DPDK EM insert for FKB to use limited size Type 3 key.
- Update FKB builder to be able to tell between EM and WC keys
  during transform.
FKB is the Flexible Key Builder in Thor used while inserting flows.

Signed-off-by: Peter Spreadborough <peter.spreadborough@broadcom.com>
Signed-off-by: Venkat Duvvuru <venkatkumar.duvvuru@broadcom.com>
Reviewed-by: Randy Schacher <stuart.schacher@broadcom.com>
Reviewed-by: Farah Smith <farah.smith@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>