Add kati to root.bp

Change-Id: Iedf8401fb02d704916666fb15c5ae30951a57ac7
diff --git a/root.bp b/root.bp
index 6f20832..d32cf8a 100644
--- a/root.bp
+++ b/root.bp
@@ -2,6 +2,7 @@
 
 subdirs = [
     "build/blueprint",
+    "build/kati",
     "build/soong",
     "bionic/*",
     "dalvik",