treewide: Add SPDX license identifier - Makefile/Kconfig

Add SPDX license identifiers to all Make/Kconfig files which:

 - Have no license information of any form

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

  GPL-2.0-only

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/net/xdp/Kconfig b/net/xdp/Kconfig
index 0255b33..71af2fe 100644
--- a/net/xdp/Kconfig
+++ b/net/xdp/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 config XDP_SOCKETS
 	bool "XDP sockets"
 	depends on BPF_SYSCALL