audio: add the files for low latency

They are use by the GOogle Play Store to filter devices
that might need low latency feature.

Bug: 189793763
Test: Build and check the files
Change-Id: Ibf71147b971bfc4fe4e769772851e604203395b8
diff --git a/device.mk b/device.mk
index b3f9670..06c79e6 100644
--- a/device.mk
+++ b/device.mk
@@ -599,6 +599,8 @@
 	frameworks/native/data/etc/android.hardware.wifi.passpoint.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.wifi.passpoint.xml \
 	frameworks/native/data/etc/android.hardware.usb.host.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.usb.host.xml \
 	frameworks/native/data/etc/android.hardware.usb.accessory.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.usb.accessory.xml \
+
+PRODUCT_COPY_FILES += \
 	frameworks/native/data/etc/android.hardware.audio.low_latency.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.audio.low_latency.xml \
 	frameworks/native/data/etc/android.hardware.audio.pro.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.audio.pro.xml \