[mythtvnz] TeVii S421

[Austin]

Update on my S421 problems: dvbtune now works, and outputs all the station 
info XML stuff. However, 'scan' will not tune. As noted by Stephen Worthington, 
no firmware was loaded during boot, and this is the case even after a cold 
boot. The card state is wrongly detected and reported in dmesg as 'warm'. I 
assume this is why 'scan' gets nowhere.  Probably an issue to be fixed by the 
driver maintainers, but if anyone has any ideas...