netfilter.mk: add conntrack support to nft bridge

This allows to implement statefull bridge filtering

As the uncompressed size is only 7.6k (arm64), just add
nf_conntrack_bridge.ko to kmod-nft-bridge package

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

include/netfilter.mk

@@ -332,6 +332,7 @@ $(eval $(if $(NF_KMOD),$(call nf_add,NFT_CORE,CONFIG_NFT_REJECT_INET, $(P_XT)nft
 
 $(eval $(if $(NF_KMOD),$(call nf_add,NFT_BRIDGE,CONFIG_NFT_BRIDGE_META, $(P_EBT)nft_meta_bridge),))
 $(eval $(if $(NF_KMOD),$(call nf_add,NFT_BRIDGE,CONFIG_NFT_BRIDGE_REJECT, $(P_EBT)nft_reject_bridge),))
+$(eval $(if $(NF_KMOD),$(call nf_add,NFT_BRIDGE,CONFIG_NF_CONNTRACK_BRIDGE, $(P_EBT)nf_conntrack_bridge),))
 
 $(eval $(if $(NF_KMOD),$(call nf_add,NFT_NAT,CONFIG_NFT_NAT, $(P_XT)nft_nat),))
 $(eval $(if $(NF_KMOD),$(call nf_add,NFT_NAT,CONFIG_NFT_NAT, $(P_XT)nft_chain_nat),))