Copyright: Move to SPDX-Identifier

SPDX-Identifier cleans up the files and creates visibility on each file
while not using too much space.

Replacing all instances on the long apache-2.0 text and adding the
SPDX-Identifier where not present before.

Change-Id: I7566febfd29dac6c81df6ff4045a6663aa50fca4
Signed-off-by: Christopher Meis <christopher.meis@9elements.com>
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/multi-presence/gpio_presence.cpp b/multi-presence/gpio_presence.cpp
index 809a342..661000b 100644
--- a/multi-presence/gpio_presence.cpp
+++ b/multi-presence/gpio_presence.cpp
@@ -1,19 +1,5 @@
-/**
- * Copyright © 2019 Facebook
- * Copyright © 2023 9elements GmbH
- *
- * 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.
- */
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: Copyright OpenBMC Authors
 
 #include "gpio_presence.hpp"
 
diff --git a/multi-presence/gpio_presence.hpp b/multi-presence/gpio_presence.hpp
index c34ed75..19b6503 100644
--- a/multi-presence/gpio_presence.hpp
+++ b/multi-presence/gpio_presence.hpp
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: Copyright OpenBMC Authors
+
 #pragma once
 
 #include <gpiod.h>
diff --git a/multi-presence/main.cpp b/multi-presence/main.cpp
index b7fba2e..73c91b1 100644
--- a/multi-presence/main.cpp
+++ b/multi-presence/main.cpp
@@ -1,19 +1,5 @@
-/**
- * Copyright © 2019 Facebook
- * Copyright © 2023 9elements GmbH
- *
- * 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.
- */
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: Copyright OpenBMC Authors
 
 #include "gpio_presence.hpp"