scripts/spdxcheck: Exclude config directories

Kernel configuration files like default configs are machine generated and
pretty useless outside of the kernel context.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

scripts/spdxexclude

@@ -6,3 +6,8 @@
 # create lots of noise for no value
 LICENSES/
 license-rules.rst
+
+# Ignore config files and snippets. The majority is generated
+# by the Kconfig tools
+kernel/configs/
+arch/*/configs/