net/bnxt: fix function driver register/unregister

net/bnxt: fix function driver register/unregister

1. Fix to use correct fields in the request structure of
   HWRM_FUNC_DRV_RGTR.
2. Remove the "flags" argument to bnxt_hwrm_func_driver_unregister()
   as it is not needed.

Fixes: beb3087f5056 ("net/bnxt: add driver register/unregister")
Cc: stable@dpdk.org
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Lance Richardson <lance.richardson@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>