Enable multi-dex for incremental settings builds

Change-Id: I265eb5ff508206bd5b4205db612c3519bb9a5ed8
diff --git a/Android.mk b/Android.mk
index 72db1ab..683db50 100644
--- a/Android.mk
+++ b/Android.mk
@@ -35,6 +35,8 @@
 ifneq ($(INCREMENTAL_BUILDS),)
     LOCAL_PROGUARD_ENABLED := disabled
     LOCAL_JACK_ENABLED := incremental
+    LOCAL_DX_FLAGS := --multi-dex
+    LOCAL_JACK_FLAGS := --multi-dex native
 endif
 
 include frameworks/opt/setupwizard/library/common.mk