FP4: Switch to SPDX copyright & update dates

Change-Id: I1adc8afc557a0d8a7379ec24589ea68b2391d147
diff --git a/manifest.xml b/manifest.xml
index 9d2c80a..2e120ea 100644
--- a/manifest.xml
+++ b/manifest.xml
@@ -1,3 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     SPDX-FileCopyrightText: 2022 The Linux Foundation
+     SPDX-License-Identifier: BSD-3-Clause
+-->
 <manifest version="2.0" type="device" target-level="5">
     <hal format="hidl">
         <name>android.hardware.audio</name>