Recognize AML Meson8 baby platform - S805 chip

Recognize Amlogic S805 chip, will need it for deciding if we should play h265 or not (S805 supports it, S802 doesn't). I don't have any S805 board here at the moment so will not make any changes to AMLCodec. Will get one within week or two then I can test and PR AMLCodec changes.
Just check for M8B first.