ASoC: twl4030: Support for DT booted kernel

When the kernel has been booted with DT blob the platform data is NULL for
the driver.
We need to construct the pdata based on the DT information for runtime use.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>