AESinkALSA: Set correct value for AES3 when using HBR mode

According to the HDMI 1.4a document, the only acceptable value
for AES3 in HBR mode is 0x09, which corresponds to a frame rate
of 768000. Some sinks or drivers ignore this, but some do not.
AESinkALSA: Allow fragmentation, e.g. even multiply of PeriodSize
renderer: use 3 render buffers for sw decoding, restores bahavior after 71f50d3677409a3ba3f8533daae105e6e0366a1
Merge pull request #5682 from fritsch/cubox

AE: Some fixes for the Cubox hardware
Merge pull request #5689 from FernetMenta/renderbuffers

renderer: use 3 render buffers for sw decoding, restores bahavior after ...