sync up drm.h

    a) delta: drm: use pad as flags in drm_syncobj_timeline_array.
    b) Generated using make headers_install.
    c) Generated from origin/drm-misc-next commit 949561eb85bcee10248e7da51d44a0325d5e0d1b"

Signed-off-by: Chunming Zhou <david1.zhou@amd.com>