Update to ConnectivityService to use utils

Update to ConnectivityService to use permission utils to validate the
existence of a system feature.

Bug: 210485380
Test: atest FrameworksNetTests:
com.android.server.ConnectivityServiceTest

Change-Id: Ia537cc5b37ef8d80f49f1a83ba572b3b8a9f6874

service/src/com/android/server/ConnectivityService.java

@@ -10235,12 +10235,8 @@ public class ConnectivityService extends IConnectivityManager.Stub
     }
 
     private void enforceAutomotiveDevice() {
-        final boolean isAutomotiveDevice =
-                mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_AUTOMOTIVE);
-        if (!isAutomotiveDevice) {
-            throw new UnsupportedOperationException(
-                    "setOemNetworkPreference() is only available on automotive devices.");
-        }
+        PermissionUtils.enforceSystemFeature(mContext, PackageManager.FEATURE_AUTOMOTIVE,
+                "setOemNetworkPreference() is only available on automotive devices.");
     }
 
     /**