ASoC: sunxi: depend on ARCH_SUNXI

Depend on ARCH_SUNXI or COMPILE_TEST as it doesn't make sense to enable
these if the appropriate SoC they're embedded in isn't enabled.
Signed-off-by: NPeter Robinson <pbrobinson@gmail.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/sunxi/Kconfig

 menu "Allwinner SoC Audio support"
+	depends on ARCH_SUNXI || COMPILE_TEST
 
 config SND_SUN4I_CODEC
 	tristate "Allwinner A10 Codec Support"