Add cleanspec for moved aidl file

Make is globing everything in $(intermediates.COMMON)/src for generated
source files, which is causing a moved aidl file to be seen in both
its new and old locations for incremental builds.  Wipe the generated
source directory to fix incremental builds.

Bug: 36698184
Test: m -j android-support-customtabs
Change-Id: I067909290b7ff8b1b564c303e04f8d43a43a053e
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 7b2174e..dafdd94 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -46,6 +46,7 @@
 
 $(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/JAVA_LIBRARIES/android-support-v*)
 $(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/support.aidl)
+$(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/JAVA_LIBRARIES/android-support-customtabs_intermediates/src/)
 
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST