Run vehicle HAL service as vehicle_network user

Fix: b/33594725

Test: verified it runs as vehicle_network user
Change-Id: If72cfb582c63344c8ca13d6c333f9642a8fd1ca4
diff --git a/vehicle/2.0/default/android.hardware.vehicle@2.0-service.rc b/vehicle/2.0/default/android.hardware.vehicle@2.0-service.rc
index 7c96da6..622cb1e 100644
--- a/vehicle/2.0/default/android.hardware.vehicle@2.0-service.rc
+++ b/vehicle/2.0/default/android.hardware.vehicle@2.0-service.rc
@@ -1,4 +1,4 @@
 service vehicle-hal-2.0 /system/bin/hw/android.hardware.vehicle@2.0-service
     class hal
-    user system
+    user vehicle_network
     group system