disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/drivers/net/ethernet/apm/xgene/Kconfig
..
..
@@ -1,3 +1,4 @@
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+# SPDX-License-Identifier: GPL-2.0-only
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 config NET_XGENE
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 	tristate "APM X-Gene SoC Ethernet Driver"
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 	depends on ARCH_XGENE || COMPILE_TEST