Audio assets at 48000 Hz

Bug: 7397767
Change-Id: If62c2219adf61f0c1b2115a83b7394d76829c028
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 14b3681..53345f9 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -137,6 +137,7 @@
 $(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/APPS/ImageProcessing_intermediates)
 $(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/APPS/ImageProcessing2_intermediates)
 $(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/APPS/ImageProcessing_intermediates)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/media/audio/ui/*.ogg)
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************