TDM audio support and sample size updates for tegra30

A patch series for TDM audio, non 16bit sample size and a small fifo fix
for tegra30 series SoC.

Changes since v1:
- moved edge-control and data-offset to the set_fmt callbacks
- fixed dev_dbg in set_tdm callback
- fixed dev_dbg message contents in set_tdm callback
- changed fsync width to be permanently 1 clock