Fixes around VM_FPNMAP and follow_pfn

- replace mm/frame_vector.c by get_user_pages in misc/habana and
  drm/exynos drivers, then move that into media as it's sole user
- close race in generic_access_phys
- s390 pci ioctl fix of this series landed in 5.11 already
- properly revoke iomem mappings (/dev/mem, pci files)
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