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>

tools/perf/Documentation/Makefile

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 include ../../scripts/Makefile.include
 include ../../scripts/utilities.mak
 

tools/perf/Makefile.config

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 
 ifeq ($(src-perf),)
 src-perf := $(srctree)/tools/perf

tools/perf/Makefile.perf

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 include ../scripts/Makefile.include
 include ../scripts/Makefile.arch
 

tools/perf/arch/arm/Makefile

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 ifndef NO_DWARF
 PERF_HAVE_DWARF_REGS := 1
 endif

tools/perf/arch/csky/Makefile

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 ifndef NO_DWARF
 PERF_HAVE_DWARF_REGS := 1
 endif

tools/perf/arch/s390/Makefile

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 ifndef NO_DWARF
 PERF_HAVE_DWARF_REGS := 1
 endif

tools/perf/arch/sh/Makefile

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 ifndef NO_DWARF
 PERF_HAVE_DWARF_REGS := 1
 endif

tools/perf/arch/sparc/Makefile

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 ifndef NO_DWARF
 PERF_HAVE_DWARF_REGS := 1
 endif

tools/perf/arch/xtensa/Makefile

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 ifndef NO_DWARF
 PERF_HAVE_DWARF_REGS := 1
 endif