Fix tinyhal / audio configuration

tinyhal loads audio.$(getprop ro.product.device).xml
configuration file for audio mixer control and routing
changes. So copy audio.sdm845.xml accordingly.

Fixes: 298ae955c9b8 ("Remove sdm845-userdebug build target")
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
diff --git a/axolotl/device.mk b/axolotl/device.mk
index 7b2ffbd..2cf4300 100644
--- a/axolotl/device.mk
+++ b/axolotl/device.mk
@@ -17,6 +17,7 @@
 PRODUCT_COPY_FILES := \
     $(LOCAL_PATH)/fstab.ramdisk:$(TARGET_COPY_OUT_RAMDISK)/fstab.axolotl \
     $(LOCAL_PATH)/fstab.ramdisk:$(TARGET_COPY_OUT_VENDOR)/etc/fstab.axolotl \
+    device/generic/sdm845/etc/audio.sdm845.xml:$(TARGET_COPY_OUT_VENDOR)/etc/audio.axolotl.xml \
     device/generic/sdm845/init.common.rc:$(TARGET_COPY_OUT_VENDOR)/etc/init/init.axolotl.rc \
     device/generic/sdm845/init.common.usb.rc:$(TARGET_COPY_OUT_VENDOR)/etc/init/init.axolotl.usb.rc \
     device/generic/sdm845/common.kl:$(TARGET_COPY_OUT_VENDOR)/usr/keylayout/axolotl.kl