Vibrator: Stable AIDL interface.

This is from running:
hidl2aidl android.hardware.vibrator@1.4

and then making several small modifications.

Bug: 141828236
Test: dumpsys on cf
Change-Id: I612e903c1e3f63f0470f8e5c827345c5b67d5645
diff --git a/vibrator/staidl/default/vibrator-default.rc b/vibrator/staidl/default/vibrator-default.rc
new file mode 100644
index 0000000..d17f468
--- /dev/null
+++ b/vibrator/staidl/default/vibrator-default.rc
@@ -0,0 +1,4 @@
+service vendor.vibrator-default /vendor/bin/hw/android.hardware.vibrator-service.example
+    class hal
+    user system
+    group system