ASoC: imx: Enable COMPILE_TEST builds

Since DT based boards don't have any dependency on arch/arm enable them
if COMPILE_TEST is enabled.
Signed-off-by: NMark Brown <broonie@linaro.org>
Acked-by: NShawn Guo <shawn.guo@linaro.org>

sound/soc/fsl/Kconfig

@@ -98,7 +98,7 @@ endif # SND_POWERPC_SOC
 
 menuconfig SND_IMX_SOC
 	tristate "SoC Audio for Freescale i.MX CPUs"
-	depends on ARCH_MXC
+	depends on ARCH_MXC || COMPILE_TEST
 	help
 	  Say Y or M if you want to add support for codecs attached to
 	  the i.MX CPUs.