tcg/aarch64/tcg-target.opc.h: Add copyright/license

Add the copyright/license boilerplate for target/aarch64/tcg-target.opc.h.
This file has only had two commits: 14e4c1e
and 79525df, both by the same Linaro engineer.
The license is GPL-2-or-later, since that's what the
rest of tcg/aarch64 uses.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20191025155848.17362-2-peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg/aarch64/tcg-target.opc.h

@@ -1,5 +1,14 @@
-/* Target-specific opcodes for host vector expansion.  These will be
-   emitted by tcg_expand_vec_op.  For those familiar with GCC internals,
-   consider these to be UNSPEC with names.  */
+/*
+ * Copyright (c) 2019 Linaro
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * (at your option) any later version.
+ *
+ * See the COPYING file in the top-level directory for details.
+ *
+ * Target-specific opcodes for host vector expansion.  These will be
+ * emitted by tcg_expand_vec_op.  For those familiar with GCC internals,
+ * consider these to be UNSPEC with names.
+ */
 
 DEF(aa64_sshl_vec, 1, 2, 0, IMPLVEC)