net/bnxt: remove unused function parameters

net/bnxt: remove unused function parameters

1. Clean up unused function parameters.
2. Declare no external referenced function as static and remove
   their prototype from the header file.

Fixes: ec77c6298301 ("net/bnxt: add stats context allocation")
Fixes: 200b64ba0be8 ("net/bnxt: free statistics context")
Cc: stable@dpdk.org
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>