Add missing copyright and GPL notice to baseboards/msp430-sim.exp

This commit applies a patch submitted by Nick Clifton to add these notices.

The email carrying the patch quoted a reply from the FSF copyright clerk
affirming that copyright for this file had been properly assigned to the FSF,
but the quoted text did not include a ticket number.

baseboards/msp430-sim.exp

@@ -1,3 +1,23 @@
+# Copyright (C) 2020 Free Software Foundation, Inc.
+#
+# This file is part of DejaGnu.
+#
+# DejaGnu is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# DejaGnu is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with DejaGnu; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
+
+# Contributed by Nick Clifton <nickc@redhat.com>.
+
 # This is a list of toolchains that are supported on this board.
 set_board_info target_install {msp430-elf}