add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/powerpc/configs/ppc6xx_defconfig
..
..
@@ -245,8 +245,6 @@
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 CONFIG_ATM_BR2684=m
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 CONFIG_BRIDGE=m
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 CONFIG_VLAN_8021Q=m
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-CONFIG_DECNET=m
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-CONFIG_DECNET_ROUTER=y
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 CONFIG_ATALK=m
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 CONFIG_DEV_APPLETALK=m
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 CONFIG_IPDDP=m