ASoC: tegra: Enable COMPILE_TEST builds

Since there is no architecture dependency in the code allow it to be built
on any platform when COMPILE_TEST is enabled.
Signed-off-by: NMark Brown <broonie@linaro.org>
Acked-by: NStephen Warren <swarren@nvidia.com>

sound/soc/tegra/Kconfig

 config SND_SOC_TEGRA
 	tristate "SoC Audio for the Tegra System-on-Chip"
-	depends on ARCH_TEGRA && TEGRA20_APB_DMA
+	depends on (ARCH_TEGRA && TEGRA20_APB_DMA) || COMPILE_TEST
 	select REGMAP_MMIO
 	select SND_SOC_GENERIC_DMAENGINE_PCM
 	help