zenfone7: Import audio_effects_ZS670KS from stock

And rename it to audio_effects.xml because we build libeffectsconfig from source now and it expect this files .
audio_effects_ZS670KS is needed for the custom Asus libeffectsconfig

Change-Id: I5dd5541d234d803dd3b2cc45cf9768472ff26578
diff --git a/device.mk b/device.mk
index ea18ec2..c1bc608 100755
--- a/device.mk
+++ b/device.mk
@@ -41,6 +41,7 @@
 
 # audio
 PRODUCT_COPY_FILES += \
+    $(LOCAL_PATH)/audio/audio_effects_ZS670KS.xml:$(TARGET_COPY_OUT_VENDOR)/etc/audio_effects.xml \
     $(LOCAL_PATH)/audio/audio_policy_configuration_ZS670KS.xml:$(TARGET_COPY_OUT_VENDOR)/etc/audio/audio_policy_configuration.xml \
     $(LOCAL_PATH)/audio/audio_policy_configuration_ZS670KS.xml:$(TARGET_COPY_OUT_VENDOR)/etc/audio_policy_configuration.xml \
     $(LOCAL_PATH)/audio/audio_policy_volumes_ZS670KS.xml:$(TARGET_COPY_OUT_VENDOR)/etc/audio_policy_volumes_ZS670KS.xml