AIDEGen: Adopt prebuilt mechanism to bypass 'm aidegen'.

Bug: 119642842
Test: m clean;aidegen tradefed
Change-Id: Ib25591de77762ffdcc72ea4a064a50cfb3e5015e
diff --git a/CleanSpec.mk b/CleanSpec.mk
index a4b7c26..8058d86 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -519,6 +519,9 @@
 
 $(call add-clean-step, find $(OUT_DIR)/target/product/mainline_arm64/system -type f -name "*.*dex" -print0 | xargs -0 rm -f)
 
+# Clean up aidegen
+$(call add-clean-step, rm -f $(HOST_OUT)/bin/aidegen)
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************