headers: Sync with drm-next

headers: Sync with drm-next

Taken from the drm-next pull for 4.17-rc1 (694f54f680f7), and manually
reconciled:

  core:
    - Dropped DRM_MODE_TYPE_ALL and DRM_MODE_FLAG_ALL; these are purely
      internal details of the bits accepted by the currently running
      kernel, and can not be generally relied on by userspace
    - Add HDCP flags
    - Note CTM entry representation is sign-magnitude format, not
      two's-complement
  amdgpu:
    - Add QUERY_STATE2 context op
    - Add VCN firmware version query
  etnaviv:
    - Add more GPU feature flags
  i915:
    - Add caps, params and ioctls for PMU / perf-stream
    - Add support for explicit fencing
  nouveau:
    - Add TILE_COMP layout
  vc4:
    - Add perfmon ioctls
  virtgpu:
    - Add capset-fix param
  vmware:
    - Add handle-close ioctl and explicit-fencing support

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>