Make test 971-iface-super smaller to prevent gcstress timeouts.

Change-Id: I0c0c5eb58936335c48e15cb7e899ab3a7ddbc00f
diff --git a/test/971-iface-super/util-src/generate_smali.py b/test/971-iface-super/util-src/generate_smali.py
index f01c904..3681411 100755
--- a/test/971-iface-super/util-src/generate_smali.py
+++ b/test/971-iface-super/util-src/generate_smali.py
@@ -39,7 +39,7 @@
 import string
 
 # The max depth the type tree can have.
-MAX_IFACE_DEPTH = 3
+MAX_IFACE_DEPTH = 2
 
 class MainClass(mixins.DumpMixin, mixins.Named, mixins.SmaliFileMixin):
   """