change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/drivers/tty/serdev/Makefile
..
..
@@ -1,3 +1,4 @@
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+# SPDX-License-Identifier: GPL-2.0
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 serdev-objs := core.o
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 obj-$(CONFIG_SERIAL_DEV_BUS) += serdev.o