nfd: Add namespace for NodeFeatureRule

[hershpa]

Use explicit openshift-nfd namespace instead of implicit namespace which can vary based on which project user creates the CR. Signed-off-by: Hersh Pathak [email protected]

[mythi]

Note that NodeFeatureRules are cluster scoped

[uMartinXu]

Note that NodeFeatureRules are cluster scoped

Thanks! We ever talked with the maintainer of the OCP NFD operator, and according to him, the cluster administrator needs to manage and manage the related NodeFeatureRules for his/her cluster. So our NodeFeatureRules is a Reference for the administrator. see notes in https://github.com/intel/intel-technology-enabling-for-openshift/tree/main/nfd#configure-nfd-operator