drm/amdgpu: UAPI headers for userqueue Secure semaphore

Add UAPI header support for userqueue Secure semaphore

v2: Worked on review comments from Christian for the following
    modifications

    - Add bo handles, bo flags and padding fields.
    - Include value/va in a combined array.

v3: Worked on review comments from Christian

    - Add num_fences field to obtain the number of objects required
      to allocate memory for userq_fence_info.
    - Replace obj_handle name with syncobj_handle.
    - Replace point name with syncobj_point.
    - Replace count_handles name with num_syncobj_handles.
    - Fix structure padding related issues.

v4: Worked on review comments from Christian
    - Modify the bo flags description.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>