Revert "Revert "root.bp: Add vendor/*/*""

This reverts commit b3aaaea54b551780115ea017d24a226d3a7fad7c.

Change-Id: I8ff4424f983b259fc1c1938350aa6299f1c3f0c3
diff --git a/root.bp b/root.bp
index 8b3b71f..d98bc21 100644
--- a/root.bp
+++ b/root.bp
@@ -31,4 +31,5 @@
     "system/*",
     "system/tools/*",
     "test/vts",
+    "vendor/*/*",
 ]