Comment out unused DMX definitions The upstream Linux kernel has dropped these unused definitions, so do not attempt to use them in this module: https://git.linuxtv.org/media_tree.git/commit/?id=13adefbe9e566c6db91579e4ce17f1e5193d6f2c https://git.linuxtv.org/media_tree.git/commit/?id=791edca5685b26d4575e59f5420ba3e206f5cebb
