ART: Move simulator to art/

Move the simulator library out of the runtime directory. Let's not
pollute the runtime library.

Test: m
Change-Id: I351a0061ae628c3af0462b72d4de727db296ec23
diff --git a/Android.bp b/Android.bp
index d0e22fb..0ce86d8 100644
--- a/Android.bp
+++ b/Android.bp
@@ -35,6 +35,7 @@
     "profman",
     "runtime",
     "sigchainlib",
+    "simulator",
     "test",
     "tools/cpp-define-generator",
     "tools/dmtracedump",