cgroups: add copyright header to devices.Emulator implementation

I forgot to include this in the original patchset.

Signed-off-by: Aleksa Sarai <asarai@suse.de>

libcontainer/cgroups/devices/devices_emulator.go

@@ -1,5 +1,23 @@
 // +build linux
 
+// SPDX-License-Identifier: Apache-2.0
+/*
+ * Copyright (C) 2020 Aleksa Sarai <cyphar@cyphar.com>
+ * Copyright (C) 2020 SUSE LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package devices
 
 import (

libcontainer/cgroups/devices/devices_emulator_test.go

@@ -1,3 +1,21 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+ * Copyright (C) 2020 Aleksa Sarai <cyphar@cyphar.com>
+ * Copyright (C) 2020 SUSE LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package devices
 
 import (