stable aidl vibrator policy

Bug: 141828236
Test: boot, dumpsys -l
Change-Id: Id3fc8724238883116e840794309efbf6c91226c9
diff --git a/private/service_contexts b/private/service_contexts
index defdfa4..4041a60 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -1,3 +1,5 @@
+android.hardware.vibrator.IVibrator/default u:object_r:hal_vibrator_service:s0
+
 accessibility                             u:object_r:accessibility_service:s0
 account                                   u:object_r:account_service:s0
 activity                                  u:object_r:activity_service:s0