ASoC: Kconfig: OMAP4: Enable support for PandaBoards

Enable ASoC audio support for OMAP4 based machines with
twl6040 codec via the omap-abe-twl6040 machine driver.

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