commonlib,console,nb,sb,security: Add SPDX licenses to Makefiles

To help identify the licenses of the various files contained in the
coreboot source, we've added SPDX headers to the top of all of the
.c and .h files. This extends that practice to Makefiles.

Any file in the coreboot project without a specific license is bound
to the license of the overall coreboot project, GPL Version 2.

This patch adds the GPL V2 license identifier to the top of all
makefiles in the commonlib, console, northbridge, security, and
southbridge directories that don't already have an SPDX license line
at the top.

Signed-off-by: Martin Roth <gaumless@gmail.com>
Change-Id: I02804a10d0b0355e41271a035613d9f3dfb122f8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68985
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
diff --git a/src/security/Makefile.inc b/src/security/Makefile.inc
index 72b87db..b7922d4 100644
--- a/src/security/Makefile.inc
+++ b/src/security/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
 subdirs-y += vboot
 subdirs-y += tpm
 subdirs-y += memory
diff --git a/src/security/intel/Makefile.inc b/src/security/intel/Makefile.inc
index 20aea27..25e28ed 100644
--- a/src/security/intel/Makefile.inc
+++ b/src/security/intel/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
 subdirs-y += txt
 subdirs-y += stm
 subdirs-y += cbnt
diff --git a/src/security/intel/cbnt/Makefile.inc b/src/security/intel/cbnt/Makefile.inc
index 4c585b8..e166634 100644
--- a/src/security/intel/cbnt/Makefile.inc
+++ b/src/security/intel/cbnt/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
 ifeq ($(CONFIG_INTEL_CBNT_SUPPORT),y)
 
 all-y += logging.c
diff --git a/src/security/intel/stm/Makefile.inc b/src/security/intel/stm/Makefile.inc
index d4da605..90b7c18 100644
--- a/src/security/intel/stm/Makefile.inc
+++ b/src/security/intel/stm/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
 
 # put the stm where it can be found
 
diff --git a/src/security/intel/txt/Makefile.inc b/src/security/intel/txt/Makefile.inc
index e19bacf..c1fc0c4 100644
--- a/src/security/intel/txt/Makefile.inc
+++ b/src/security/intel/txt/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
 romstage-$(CONFIG_INTEL_TXT_LIB) += txtlib.c
 
 ifeq ($(CONFIG_INTEL_TXT),y)
diff --git a/src/security/memory/Makefile.inc b/src/security/memory/Makefile.inc
index 0882ca3..4f07bbb 100644
--- a/src/security/memory/Makefile.inc
+++ b/src/security/memory/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
 romstage-$(CONFIG_PLATFORM_HAS_DRAM_CLEAR) += memory.c
 postcar-$(CONFIG_PLATFORM_HAS_DRAM_CLEAR) += memory.c
 ramstage-$(CONFIG_PLATFORM_HAS_DRAM_CLEAR) += memory.c
diff --git a/src/security/tpm/Makefile.inc b/src/security/tpm/Makefile.inc
index ae06cb0..ade9656 100644
--- a/src/security/tpm/Makefile.inc
+++ b/src/security/tpm/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
 subdirs-$(CONFIG_TPM_GOOGLE) += tss/vendor/cr50
 
 ## TSS
diff --git a/src/security/tpm/tss/vendor/cr50/Makefile.inc b/src/security/tpm/tss/vendor/cr50/Makefile.inc
index 8bacafd..0a16fa1 100644
--- a/src/security/tpm/tss/vendor/cr50/Makefile.inc
+++ b/src/security/tpm/tss/vendor/cr50/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
 ramstage-y += cr50.c
 romstage-y += cr50.c
 postcar-y += cr50.c