Make asm-3.1 an optional module, remove from grandfathered list

Change-Id: I880cb298fad81d439e557ff5949cc9105bec217b
diff --git a/core/user_tags.mk b/core/user_tags.mk
index b88e541..d5aa24d 100644
--- a/core/user_tags.mk
+++ b/core/user_tags.mk
@@ -50,7 +50,6 @@
 	applypatch \
 	app_process \
 	archquery \
-	asm-3.1 \
 	atree \
 	audio \
 	badblocks \