ramips: sound-mt7620: fix dependencies for kernel 4.9

With kernel 4.8 common used code was moved to a shared kmod. Add the
missing dependency to the shared snd-soc-simple-card-utils.ko.

Signed-off-by: Mathias Kresin <dev@kresin.me>

target/linux/ramips/modules.mk

@@ -120,10 +120,12 @@ define KernelPackage/sound-mt7620
   KCONFIG:= \
 	CONFIG_SND_RALINK_SOC_I2S \
 	CONFIG_SND_SIMPLE_CARD \
+	CONFIG_SND_SIMPLE_CARD_UTILS \
 	CONFIG_SND_SOC_WM8960
   FILES:= \
 	$(LINUX_DIR)/sound/soc/ralink/snd-soc-ralink-i2s.ko \
 	$(LINUX_DIR)/sound/soc/generic/snd-soc-simple-card.ko \
+	$(LINUX_DIR)/sound/soc/generic/snd-soc-simple-card-utils.ko \
 	$(LINUX_DIR)/sound/soc/codecs/snd-soc-wm8960.ko
   AUTOLOAD:=$(call AutoLoad,90,snd-soc-wm8960 snd-soc-ralink-i2s snd-soc-simple-card)
   $(call AddDepends/sound)