[dts] [PATCH V1]test_plans/cvl_advanced_iavf_rss_test_plan:remove vxlan and nvgre pkts

[Tu, Lijuan]

> till dpdk 20.11, iavf rss cannot support vxlan and nvgre ptype.
> so remove vxlan and nvgre pkts from test plan.
> 
> Signed-off-by: qifu <qi.fu at intel.com>

Applied