Add frameworks/rs to root.bp

Test: m -j blueprint_tools (just to generate build.ninja)
Change-Id: I26c36d2e9af13df07a3ea2240b85ae9bf2e6e80b
diff --git a/root.bp b/root.bp
index 69933e8..d82e09d 100644
--- a/root.bp
+++ b/root.bp
@@ -15,6 +15,7 @@
     "frameworks/av",
     "frameworks/base",
     "frameworks/native",
+    "frameworks/rs",
     "frameworks/wilhelm",
     "hardware/*",
     "libcore",