Port 55000: added command EXT20 (HDMI1)

git-svn-id: svn://svn.code.sf.net/p/fhem/code@5209 2b470e98-0d58-463d-a4d8-8e2adae1ed80
git-svn-id: svn://svn.code.sf.net/p/fhem/code@5210 2b470e98-0d58-463d-a4d8-8e2adae1ed80