ASoC: ti: davinci-mcasp: Add support for RIGHT_J format

The formater unit's rotation needs to be programmed differently for right
aligned bus format to have the data moved to the correct place.

Take the opportunity and simplify the formater unit setup code.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20190725083411.7211-1-peter.ujfalusi@ti.com


Signed-off-by: Mark Brown <broonie@kernel.org>