ASoC: Intel: Add dependency on DesignWare DMA controller

We have calls into the controller so we need to ensure it is being
built.
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/intel/Kconfig

@@ -20,6 +20,7 @@ config SND_SOC_INTEL_SST
 	tristate "ASoC support for Intel(R) Smart Sound Technology"
 	select SND_SOC_INTEL_SST_ACPI if ACPI
 	depends on (X86 || COMPILE_TEST)
+	depends on DW_DMAC_CORE
 	help
           This adds support for Intel(R) Smart Sound Technology (SST).
           Say Y if you have such a device