add dts config

hc

2023-12-06 08f87f769b595151be1afeff53e144f543faa614

 kernel/drivers/net/xen-netback/Makefile
..
..
@@ -1,3 +1,4 @@
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+# SPDX-License-Identifier: GPL-2.0-only
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 obj-$(CONFIG_XEN_NETDEV_BACKEND) := xen-netback.o
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 xen-netback-y := netback.o xenbus.o interface.o hash.o rx.o