kernel: fix kmod-sound-hda-core on Linux 3.18

The kmod-sound-hda-core module attempts to package snd-hda-core.ko which
does not exist in Linux 3.18, therfore only use it for kernels >= 4.1

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

package/kernel/linux/modules/sound.mk

@@ -292,17 +292,17 @@ define KernelPackage/sound-hda-core
   SUBMENU:=$(SOUND_MENU)
   TITLE:=HD Audio Sound Core Support
   KCONFIG:= \
-	CONFIG_SND_HDA_CORE \
+	CONFIG_SND_HDA_CORE@ge4.1 \
 	CONFIG_SND_HDA_HWDEP=y \
 	CONFIG_SND_HDA_RECONFIG=n \
 	CONFIG_SND_HDA_INPUT_BEEP=n \
 	CONFIG_SND_HDA_PATCH_LOADER=n \
 	CONFIG_SND_HDA_GENERIC
   FILES:= \
-	$(LINUX_DIR)/sound/hda/snd-hda-core.ko \
+	$(LINUX_DIR)/sound/hda/snd-hda-core.ko@ge4.1 \
 	$(LINUX_DIR)/sound/pci/hda/snd-hda-codec.ko \
 	$(LINUX_DIR)/sound/pci/hda/snd-hda-codec-generic.ko
-  AUTOLOAD:=$(call AutoProbe,snd-hda-core snd-hda-codec snd-hda-codec-generic)
+  AUTOLOAD:=$(call AutoProbe,snd-hda-core@ge4.1 snd-hda-codec snd-hda-codec-generic)
   $(call AddDepends/sound,+kmod-regmap)
 endef