netfilter: nft_reject_bridge: fix build errors due to code movement

Fix build errors in net/bridge/netfilter/nft_reject_bridge.ko
by selecting NF_REJECT_IPV4, which provides the missing symbols.

ERROR: modpost: "nf_reject_skb_v4_tcp_reset" [net/bridge/netfilter/nft_reject_bridge.ko] undefined!
ERROR: modpost: "nf_reject_skb_v4_unreach" [net/bridge/netfilter/nft_reject_bridge.ko] undefined!

Fixes: fa538f7cf05a ("netfilter: nf_reject: add reject skbuff creation helpers")
Reported-by: kernel test robot <[e-mail]>
Signed-off-by: Randy Dunlap <[e-mail]>
Signed-off-by: Pablo Neira Ayuso <[e-mail]>

net/bridge/netfilter/Kconfig

···
 config NFT_BRIDGE_REJECT
 	tristate "Netfilter nf_tables bridge reject support"
 	depends on NFT_REJECT
+	depends on NF_REJECT_IPV4
+	depends on NF_REJECT_IPV6
 	help
 	  Add support to reject packets.