add dts config

hc

2023-12-06 08f87f769b595151be1afeff53e144f543faa614

 kernel/drivers/net/ethernet/chelsio/libcxgb/Makefile
..
..
@@ -1,4 +1,5 @@
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-ccflags-y := -Idrivers/net/ethernet/chelsio/cxgb4
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+# SPDX-License-Identifier: GPL-2.0-only
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+ccflags-y := -I $(srctree)/$(src)/../cxgb4
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 obj-$(CONFIG_CHELSIO_LIB) += libcxgb.o
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