General clean up for comment in virtchnl. Signed-off-by: Sridhar Samudrala <sridhar.samudrala@intel.com> Signed-off-by: Joshua Hay <joshua.a.hay@intel.com> Signed-off-by: Qi Zhang <qi.z.zhang@intel.com> Acked-by: Beilei Xing <beilei.xing@intel.com>