raw2bmx: fix usage, --trk-out-end option is for as02 only
raw2bmx: fix usage, --trk-out-end option is for as02 only

kierank/bmxlib-bmx,kierank/bmxlib-bmx,kierank/bmxlib-bmx,Limecraft/ebu-bmx,Limecraft/ebu-bmx,ebu/ebu-bmx,xunchangguo/BMX,ebu/ebu-bmx,ebu/ebu-bmx,Limecraft/ebu-bmx,stuarthicks/bmx,xunchangguo/BMX,stuarthicks/bmx,xunchangguo/BMX,stuarthicks/bmx