Fix fileslist for system other image

This got lost from the previous backport, since systemotherimage wasn't
in AOSP yet.

(The Merged-In is a random Change-Id only on master so that this only
merges up to master)

Test: lunch aosp_marlin-eng; m -j systemotherimage
Change-Id: I92c05f27c92d877f3b83e5c5ae2e76728eb162bd
Merged-In: Iafed66e19bc114552b0261dd299379dbb37873c6
diff --git a/core/Makefile b/core/Makefile
index 74ffc96..5cd2fe4 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1638,7 +1638,8 @@
 	@echo Installed file list: $@
 	@mkdir -p $(dir $@)
 	@rm -f $@
-	$(hide) build/tools/fileslist.py $(TARGET_OUT_SYSTEM_OTHER) > $@
+	$(hide) build/tools/fileslist.py $(TARGET_OUT_SYSTEM_OTHER) > $(@:.txt=.json)
+	$(hide) build/tools/fileslist_util.py -c $(@:.txt=.json) > $@
 
 systemotherimage_intermediates := \
     $(call intermediates-dir-for,PACKAGING,system_other)