net/iavf: delete unsupported RSS types

The combined hash type should be bound with prefix protocol when
configure it, so delete some useless and unsupported part for
rss types mapping.

Fixes: 7be10c3004be ("net/iavf: add RSS configuration for VF")
Cc: stable@dpdk.org
Signed-off-by: Jeff Guo <jia.guo@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>