Use $(BUILD_SYSTEM) as the LOCAL_PATH of auto-generated modules.

So that we don't mess up with the vendor path check by accident.

Bug: 27543283
Change-Id: I6c34caefe3ff4abfdd8349a32c68fcca524cfd8e
diff --git a/core/pdk_fusion_modules.mk b/core/pdk_fusion_modules.mk
index 369ecbb..49b30dc 100644
--- a/core/pdk_fusion_modules.mk
+++ b/core/pdk_fusion_modules.mk
@@ -39,6 +39,9 @@
 	$(hide) touch $$@
 endef
 
+# We don't have a LOCAL_PATH for the auto-generated modules, so let it be the $(BUILD_SYSTEM).
+LOCAL_PATH := $(BUILD_SYSTEM)
+
 ##### Java libraries.
 # Only set up rules for modules that aren't built from source.
 pdk_prebuilt_libraries := $(foreach l,$(PDK.DEXPREOPT.JAVA_LIBRARIES),\