ASoC: omap: Enable COMPILE_TEST build for DT platforms

The DT platforms don't have any source dependency on any OMAP stuff so
allow them to be built when COMPILE_TEST is enabled.
Signed-off-by: NMark Brown <broonie@linaro.org>
Acked-by: NPeter Ujfalusi <peter.ujfalusi@ti.com>

sound/soc/omap/Kconfig

 config SND_OMAP_SOC
 	tristate "SoC Audio for the Texas Instruments OMAP chips"
-	depends on ARCH_OMAP && DMA_OMAP
+	depends on (ARCH_OMAP && DMA_OMAP) || (ARCH_ARM && COMPILE_TEST)
 	select SND_SOC_DMAENGINE_PCM
 
 config SND_OMAP_SOC_DMIC
@@ -26,7 +26,7 @@ config SND_OMAP_SOC_N810
 
 config SND_OMAP_SOC_RX51
 	tristate "SoC Audio support for Nokia RX-51"
-	depends on SND_OMAP_SOC && MACH_NOKIA_RX51
+	depends on SND_OMAP_SOC && ARCH_ARM && (MACH_NOKIA_RX51 || COMPILE_TEST)
 	select SND_OMAP_SOC_MCBSP
 	select SND_SOC_TLV320AIC3X
 	select SND_SOC_TPA6130A2
@@ -87,7 +87,7 @@ config SND_OMAP_SOC_OMAP_TWL4030
 
 config SND_OMAP_SOC_OMAP_ABE_TWL6040
 	tristate "SoC Audio support for OMAP boards using ABE and twl6040 codec"
-	depends on TWL6040_CORE && SND_OMAP_SOC && ARCH_OMAP4
+	depends on TWL6040_CORE && SND_OMAP_SOC && (ARCH_OMAP4 || COMPILE_TEST)
 	select SND_OMAP_SOC_DMIC
 	select SND_OMAP_SOC_MCPDM
 	select SND_SOC_TWL6040