Various Makefiles: Add SPDX-License-Identifier tags

After consulting with some of the SPDX team, the conclusion is that
Makefiles are worth adding SPDX-License-Identifier tags too, and most of
ours have one.  This adds tags to ones that lack them and converts a few
that had full (or in one case, very partial) license blobs into the
equivalent tag.

Cc: Kate Stewart <kstewart@linuxfoundation.org>
Signed-off-by: Tom Rini <trini@konsulko.com>

scripts/kconfig/Makefile

@@ -1,6 +1,9 @@
 # ===========================================================================
 # Kernel configuration targets
 # These targets are used from top-level makefile
+#
+# SPDX-License-Identifier:	GPL-2.0
+#
 
 PHONY += xconfig gconfig menuconfig config silentoldconfig update-po-config \
 	localmodconfig localyesconfig