FP4: Switch to SPDX copyright & update dates

Change-Id: I1adc8afc557a0d8a7379ec24589ea68b2391d147
diff --git a/lineage_FP4.mk b/lineage_FP4.mk
index df0f755..77f2ed1 100644
--- a/lineage_FP4.mk
+++ b/lineage_FP4.mk
@@ -1,6 +1,5 @@
 #
-# Copyright (C) 2021-2023 The LineageOS Project
-#
+# SPDX-FileCopyrightText: 2021-2024 The LineageOS Project
 # SPDX-License-Identifier: Apache-2.0
 #