add dts config

hc

2023-12-06 08f87f769b595151be1afeff53e144f543faa614

 kernel/drivers/rtc/rtc-bq4802.c
..
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /* rtc-bq4802.c: TI BQ4802 RTC driver.
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  *
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  * Copyright (C) 2008 David S. Miller <davem@davemloft.net>