FP4: Switch to SPDX copyright & update dates

Change-Id: I1adc8afc557a0d8a7379ec24589ea68b2391d147
diff --git a/device.mk b/device.mk
index 6acee68..13898f2 100644
--- a/device.mk
+++ b/device.mk
@@ -1,6 +1,5 @@
 #
-# Copyright (C) 2021 The LineageOS Project
-#
+# SPDX-FileCopyrightText: 2021-2024 The LineageOS Project
 # SPDX-License-Identifier: Apache-2.0
 #