Add DaydreamVR native libraries and services

Upstreaming the main VR system components from master-dreamos-dev
into goog/master.

Bug: None
Test: `m -j32` succeeds. Sailfish boots and basic_vr sample app works
Change-Id: I853015872afc443aecee10411ef2d6b79184d051
diff --git a/libs/vr/Android.bp b/libs/vr/Android.bp
new file mode 100644
index 0000000..e8176cf
--- /dev/null
+++ b/libs/vr/Android.bp
@@ -0,0 +1,3 @@
+subdirs = [
+    "*",
+]