Flounder: monitor orientation property for audio

Add property for orientation monitoring, read by AudioService.

Bug 17724764

Change-Id: Ib617e26216f6b2d6fad282b672fc0d9df1d1abbd
diff --git a/CleanSpec.mk b/CleanSpec.mk
index c22771d..82d72d7 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -64,3 +64,4 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj_arm/SHARED_LIBRARIES/libc_*)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj_arm/SHARED_LIBRARIES/libart_*)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj_arm/SHARED_LIBRARIES/libartd_*)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/build.prop)