build: add REUSE Compliance Check

In accordance with reuse requirements:
- Place each license file in the LICENSES/ directory
- Add missing SPDX-License-Identifier to files.
- Add .reuse/dep5 to bulk-license files

Fixes: #5887

Signed-off-by: Ruslan Mstoi <ruslan.mstoi@intel.com>

hypervisor/src/kvm/aarch64/gic/mod.rs

@@ -1,4 +1,6 @@
 // Copyright 2022 Arm Limited (or its affiliates). All rights reserved.
+//
+// SPDX-License-Identifier: Apache-2.0
 
 mod dist_regs;
 mod icc_regs;