ASoC: omap: Kconfig: Support for omap5-uevm analog audio

The analog audio is supported via omap-abe-twl6040 machine driver on
omap5-uevm.
Update the Kconfig file to reflect this and select the Palmas clock driver
which is providing the 32K clock for audio on omap5-uevm.

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