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>

drivers/target/Kconfig

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 
 menuconfig TARGET_CORE
 	tristate "Generic Target Core Mod (TCM) and ConfigFS Infrastructure"

drivers/target/iscsi/Kconfig

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 config ISCSI_TARGET
 	tristate "Linux-iSCSI.org iSCSI Target Mode Stack"
 	depends on NET

drivers/target/iscsi/cxgbit/Kconfig

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 config ISCSI_TARGET_CXGB4
 	tristate "Chelsio iSCSI target offload driver"
 	depends on ISCSI_TARGET && CHELSIO_T4 && INET

drivers/target/loopback/Kconfig

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 config LOOPBACK_TARGET
 	tristate "TCM Virtual SAS target and Linux/SCSI LDD fabric loopback module"
 	depends on SCSI

drivers/target/loopback/Makefile

@@ -1 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_LOOPBACK_TARGET)	+= tcm_loop.o

drivers/target/sbp/Kconfig

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 config SBP_TARGET
 	tristate "FireWire SBP-2 fabric module"
 	depends on FIREWIRE

drivers/target/sbp/Makefile

@@ -1 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_SBP_TARGET) += sbp_target.o

drivers/target/tcm_fc/Kconfig

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 config TCM_FC
 	tristate "TCM_FC fabric Plugin"
 	depends on LIBFC