drm/hyperv: validate resolution_count and fix WIN8 fallback

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-64524 · Microsoft / collected KEV context

cve-program · CVE-2026-64524

• https://git.kernel.org/stable/c/96f7de3172d4aa878b7f87173b2b3507c350fcd6
• https://git.kernel.org/stable/c/bc573752f3dac0d1ab8df7078c1851bc76717653
• https://git.kernel.org/stable/c/1fb565b77b8f44afabb02de6310065f109d89e94
• https://git.kernel.org/stable/c/a321c908f2eeea01539668eb270d074d9b88e490
• https://git.kernel.org/stable/c/9c698b2c43c2667c34f5336bf46ad5786216ac2a
• https://git.kernel.org/stable/c/8a114b25b5521eae451b13bce98ae978624962e5
• https://git.kernel.org/stable/c/13d33b9ef67066c77c84273fac5a1d3fde3533d1

No related operational record is retained in the current change model.