[dts] [PATCH v1]test_plans/cvl_advanced_rss_gtpu: remove gtpogre from gtpu rss test plan

[Tu, Lijuan]

> GTPoGRE will have a single test plan for RSS function.
> So remove the GTPoGRE from cvl_advanced_rss_gtpu_test_plan.rst
> 
> Signed-off-by: Peng Yuan <yuan.peng at intel.com>

Applied, thanks