ASoC: fsl: fsl_asrc: Select SND_SOC_GENERIC_DMAENGINE_PCM

Building a kernel with SND_SOC_GENERIC_DMAENGINE_PCM=n leads to the following
error:

ERROR: "snd_dmaengine_pcm_prepare_slave_config" [sound/soc/fsl/snd-soc-fsl-asrc.ko] undefined!

Let SND_SOC_FSL_ASRC select SND_SOC_GENERIC_DMAENGINE_PCM in order to fix such
error.
Reported-by: Nkbuild test robot <fengguang.wu@intel.com>
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NMark Brown <broonie@linaro.org>

sound/soc/fsl/Kconfig

@@ -5,6 +5,7 @@ comment "Common SoC Audio options for Freescale CPUs:"
 config SND_SOC_FSL_ASRC
 	tristate "Asynchronous Sample Rate Converter (ASRC) module support"
 	select REGMAP_MMIO
+	select SND_SOC_GENERIC_DMAENGINE_PCM
 	help
 	  Say Y if you want to add Asynchronous Sample Rate Converter (ASRC)
 	  support for the Freescale CPUs.