Add require_root to FakeVehicleHardwareTest.

According to b/329690075, vendor tests need root to use vendor
lib, otherwise atest will cause link error.

Test: atest FakeVehicleHardwareTest on cf_auto
Flag: EXEMPT bug
Bug: 341762230
Change-Id: I6bab19b20e6fe91dbdb2a6526172a5dd1d092ff5
diff --git a/automotive/vehicle/aidl/impl/fake_impl/hardware/test/Android.bp b/automotive/vehicle/aidl/impl/fake_impl/hardware/test/Android.bp
index 664c877..9f002dd 100644
--- a/automotive/vehicle/aidl/impl/fake_impl/hardware/test/Android.bp
+++ b/automotive/vehicle/aidl/impl/fake_impl/hardware/test/Android.bp
@@ -56,6 +56,8 @@
     defaults: [
         "VehicleHalDefaults",
     ],
+    // Need root to use vendor lib: libgrpc++.
+    require_root: true,
     test_suites: ["device-tests"],
 }