ASoC: omap: Fix incorrect ARM dependency

Commit b0e0a4d6 ("ASoC: omap: Enable COMPILE_TEST build for DT platforms")
added two incorrect CONFIG_ARCH_ARM dependencies making impossible to select
audio support for Nokia RX-51. Fix this by using correct CONFIG_ARM.
Signed-off-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/omap/Kconfig

 config SND_OMAP_SOC
 	tristate "SoC Audio for the Texas Instruments OMAP chips"
-	depends on (ARCH_OMAP && DMA_OMAP) || (ARCH_ARM && COMPILE_TEST)
+	depends on (ARCH_OMAP && DMA_OMAP) || (ARM && COMPILE_TEST)
 	select SND_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 && ARCH_ARM && (MACH_NOKIA_RX51 || COMPILE_TEST)
+	depends on SND_OMAP_SOC && ARM && (MACH_NOKIA_RX51 || COMPILE_TEST)
 	select SND_OMAP_SOC_MCBSP
 	select SND_SOC_TLV320AIC3X
 	select SND_SOC_TPA6130A2