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
Merged-In: I6bab19b20e6fe91dbdb2a6526172a5dd1d092ff5
(cherry-picked from commit: f01c7aec0d7f7db784531a5ce18a87afa9e9c0f1)

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 9819f3c..a335eea 100644
--- a/automotive/vehicle/aidl/impl/fake_impl/hardware/test/Android.bp
+++ b/automotive/vehicle/aidl/impl/fake_impl/hardware/test/Android.bp
@@ -54,6 +54,8 @@
     defaults: [
         "VehicleHalDefaults",
     ],
+    // Need root to use vendor lib: libgrpc++.
+    require_root: true,
     test_suites: ["device-tests"],
 }