Sunxi 3.4.61 r1 rt77 i2s cs4245

Hi, 
for a audio premap project (using the Cubietruck as ac3 and dts multichannel decoder) I got aware of your excelent sunxi i2s code rework/refactoring. Since my hardware setup only consists of 3 DACs connected to the cubietrucks i2s bus I needed some changes in order to operate the cubietruck in i2s MasterClock mode. Therefor I adapted the "dummy" soundcard driver sunxi-sndi2s.c to enable the soc_dai MasterClock mode. In addition I fixed some settings in regarding the MasterClock. Finaly I set the channels_max to 8 which enables multichannel output via i2s.

kind regards