hal: add audio kernel header dependency

Add dependency on audio kernel headers for cases where
audio kernel drivers are compiled as DLKM.

Change-Id: I65a45c3800df4f10481aca27be15f9be4a8a6438
diff --git a/hal/Android.mk b/hal/Android.mk
index c663323..d2cf596 100644
--- a/hal/Android.mk
+++ b/hal/Android.mk
@@ -74,6 +74,7 @@
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include
 LOCAL_ADDITIONAL_DEPENDENCIES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
 ifneq ($(filter sdm670 qcs605 msmnile,$(TARGET_BOARD_PLATFORM)),)
+  LOCAL_HEADER_LIBRARIES := audio_kernel_headers
   LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/vendor/qcom/opensource/audio-kernel/include
   LOCAL_ADDITIONAL_DEPENDENCIES += $(BOARD_VENDOR_KERNEL_MODULES)
 endif