kernel: sound: add missing symbol to sound-soc-core

This fixes compilation on zynq target when migrating
to sound kmod packages

Signed-off-by: Luis Araneda <[email protected]>

package/kernel/linux/modules/sound.mk

@@ -191,6 +191,7 @@ define KernelPackage/sound-soc-core
   DEPENDS:=+kmod-regmap-core +kmod-ac97
   KCONFIG:= \
 	CONFIG_SND_SOC \
+	CONFIG_SND_SOC_ADI=n \
 	CONFIG_SND_SOC_DMAENGINE_PCM=y \
 	CONFIG_SND_SOC_ALL_CODECS=n
   FILES:=$(LINUX_DIR)/sound/soc/snd-soc-core.ko