Fix init rc installation in vendor when LOCAL_MODULE_PATH is set

The init.rc path selection uses the same partition_tag detection to
select an installation partition. So make sure that we always set
partition_tag even if we've been given an explicit module path.

Bug: 35314904
Test: set proprietary: true to Soong module with an init rc, verify
      that was the only change to build-aosp_arm64.ninja
Change-Id: Ic6ffd7a5177959db96a34a24896b242ee5b09e41
diff --git a/CleanSpec.mk b/CleanSpec.mk
index b9f6e13..9d3fc23 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -398,6 +398,8 @@
 $(call add-clean-step, rm -rf $(HOST_OUT_TESTCASES))
 $(call add-clean-step, rm -rf $(TARGET_OUT_TESTCASES))
 
+$(call add-clean-step, rm -rf $(TARGET_OUT_ETC)/init)
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************