anv: add new gem/drm helpers

Needed for dealing with the new DRM timeline syncobj ioctls.

v2: Make use of the anv_gem_get_drm_cap() parameter... (Jason)

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/2901>
4 files changed