Improvements to audio FIFOing
hdr/Audio: split AudioChannels to allow new AudioDMASize field to differentiate OMAP4430 v 4460. Audio.s: handle FIFO underflow events of the audio stream, differentiate FIFO sizes for OMAP4430 v 4460. SDMA.s: add prefetch flag in DMA control for audio channel Submission from Willi Theiss. Version 0.34. Tagged as 'OMAP4-0_34'
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