defconfig: enable legacy ip/nf/x tables

Looks like this is needed for iptables

Author: xdevs23

arch/x86/configs/nitrous_defconfig

@@ -353,6 +353,7 @@ CONFIG_NF_FLOW_TABLE_INET=m
 CONFIG_NF_FLOW_TABLE=m
 CONFIG_NF_FLOW_TABLE_PROCFS=y
 CONFIG_NETFILTER_XTABLES_COMPAT=y
+CONFIG_NETFILTER_XTABLES_LEGACY=y
 CONFIG_NETFILTER_XT_SET=m
 CONFIG_NETFILTER_XT_TARGET_AUDIT=m
 CONFIG_NETFILTER_XT_TARGET_CHECKSUM=m