drivers: cosmetic: Convert SPDX license tags to Linux Kernel style

Complete in the drivers directory the work started with
commit 83d290c56fab ("SPDX: Convert all of our single
license tags to Linux Kernel style").

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/drivers/phy/allwinner/Makefile b/drivers/phy/allwinner/Makefile
index 5ed2702..e709fca 100644
--- a/drivers/phy/allwinner/Makefile
+++ b/drivers/phy/allwinner/Makefile
@@ -1,6 +1,6 @@
-# Copyright (C) 2016 Amarula Solutions
+# SPDX-License-Identifier: GPL-2.0+
 #
-# SPDX-License-Identifier:	GPL-2.0+
+# Copyright (C) 2016 Amarula Solutions
 #
 
 obj-$(CONFIG_PHY_SUN4I_USB)		+= phy-sun4i-usb.o