net/bnxt: fix RSS action parser

net/bnxt: fix RSS action parser

Minor fixes are needed in the RTE_FLOW RSS action parser.
1. Update the comment in the parser to indicate RSS level 1 implies RSS
   on outer header.
2. RSS action will not be supported if level is > 1.
3. RSS action will not be supported if user or application specifies
   MARK or COUNT action.
4. If RSS types is not specified i.e., is 0, the best effort RSS should
   use IPv4 and IPv6 headers. Currently we are considering only IPv4.

Fixes: 239695f754cb ("net/bnxt: enhance RSS action support")

Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Acked-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Acked-by: Somnath Kotur <somnath.kotur@broadcom.com>