CVE-2026-68267 drm/xe/rtp: Add RING_FORCE_TO_NONPRIV_DENY to OA whitelists

In the Linux kernel, the following vulnerability has been resolved: drm/xe/rtp: Add RINGFORCETONONPRIVDENY to OA whitelists Unconditionally whitelisting OA registers is a security violation. Set RINGFORCETONONPRIVDENY bit in OA nonpriv slots, so that OA registers don't get whitelisted by default...