Various Makefiles: Add SPDX-License-Identifier tags

After consulting with some of the SPDX team, the conclusion is that
Makefiles are worth adding SPDX-License-Identifier tags too, and most of
ours have one.  This adds tags to ones that lack them and converts a few
that had full (or in one case, very partial) license blobs into the
equivalent tag.

Cc: Kate Stewart <kstewart@linuxfoundation.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/Makefile b/drivers/Makefile
index ad29a4f..c9031f2 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -1,3 +1,7 @@
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
 obj-$(CONFIG_$(SPL_)DM)		+= core/
 obj-$(CONFIG_$(SPL_)CLK)	+= clk/
 obj-$(CONFIG_$(SPL_)LED)	+= led/
diff --git a/drivers/bios_emulator/Makefile b/drivers/bios_emulator/Makefile
index 2ba43ac..0a28074 100644
--- a/drivers/bios_emulator/Makefile
+++ b/drivers/bios_emulator/Makefile
@@ -1,3 +1,7 @@
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
 X86DIR  = x86emu
 
 obj-y = atibios.o biosemu.o besys.o bios.o \
diff --git a/drivers/ddr/fsl/Makefile b/drivers/ddr/fsl/Makefile
index df66c07..01ea862 100644
--- a/drivers/ddr/fsl/Makefile
+++ b/drivers/ddr/fsl/Makefile
@@ -1,9 +1,7 @@
 #
 # Copyright 2008-2014 Freescale Semiconductor, Inc.
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# Version 2 as published by the Free Software Foundation.
+# SPDX-License-Identifier:	GPL-2.0
 #
 
 obj-$(CONFIG_SYS_FSL_DDR1) += main.o util.o ctrl_regs.o options.o \
diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile
index 9bfb9c7..6124e38 100644
--- a/drivers/memory/Makefile
+++ b/drivers/memory/Makefile
@@ -1 +1,3 @@
+# SPDX-License-Identifier:	GPL-2.0+
+
 obj-$(CONFIG_TI_AEMIF) += ti-aemif.o
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index e56a17f..70d25dc 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -1,3 +1,7 @@
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
 obj-y					+= pinctrl-uclass.o
 obj-$(CONFIG_$(SPL_)PINCTRL_GENERIC)	+= pinctrl-generic.o
 
diff --git a/drivers/pinctrl/uniphier/Makefile b/drivers/pinctrl/uniphier/Makefile
index e215b10..c5cdd84 100644
--- a/drivers/pinctrl/uniphier/Makefile
+++ b/drivers/pinctrl/uniphier/Makefile
@@ -1,3 +1,7 @@
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
 obj-$(CONFIG_PINCTRL_UNIPHIER_CORE)		+= pinctrl-uniphier-core.o
 
 obj-$(CONFIG_PINCTRL_UNIPHIER_PH1_LD4)		+= pinctrl-ph1-ld4.o
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index 3d4baa5..99345eb 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -1,5 +1,7 @@
 #
 # Makefile for the U-boot SOC specific device drivers.
 #
+# SPDX-License-Identifier:	GPL-2.0+
+#
 
 obj-$(CONFIG_ARCH_KEYSTONE)	+= keystone/
diff --git a/drivers/soc/keystone/Makefile b/drivers/soc/keystone/Makefile
index c000eca..1334fa4 100644
--- a/drivers/soc/keystone/Makefile
+++ b/drivers/soc/keystone/Makefile
@@ -1 +1,5 @@
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
 obj-$(CONFIG_TI_KEYSTONE_SERDES) += keystone_serdes.o
diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
index 02bb216..0cd7302 100644
--- a/drivers/usb/dwc3/Makefile
+++ b/drivers/usb/dwc3/Makefile
@@ -1,3 +1,7 @@
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
 obj-$(CONFIG_USB_DWC3)			+= dwc3.o
 
 dwc3-y					:= core.o
diff --git a/drivers/usb/gadget/udc/Makefile b/drivers/usb/gadget/udc/Makefile
index 12380f4..1699ccd 100644
--- a/drivers/usb/gadget/udc/Makefile
+++ b/drivers/usb/gadget/udc/Makefile
@@ -1,4 +1,7 @@
 #
 # USB peripheral controller drivers
 #
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
 obj-$(CONFIG_USB_DWC3_GADGET)	+= udc-core.o
diff --git a/drivers/usb/musb-new/Makefile b/drivers/usb/musb-new/Makefile
index fd9df72..072d516 100644
--- a/drivers/usb/musb-new/Makefile
+++ b/drivers/usb/musb-new/Makefile
@@ -1,6 +1,8 @@
 #
 # for USB OTG silicon based on Mentor Graphics INVENTRA designs
 #
+# SPDX-License-Identifier:	GPL-2.0+
+#
 
 obj-$(CONFIG_USB_MUSB_GADGET) += musb_gadget.o musb_gadget_ep0.o musb_core.o
 obj-$(CONFIG_USB_MUSB_GADGET) += musb_uboot.o