According to EN 300 468 section 3.1 (Definitions):

   Unless otherwise specified within the present document all
   "reserved_future_use" bits is set to "1".

This was not the case for SDT generation so this patch fixes it.
Signed-off-by: Janne Grunau <janne-ffmpeg@jannau.net>
(cherry picked from commit a7827a17)