[NETFILTER]: nf_nat: fix NF_NAT dependency

NF_NAT depends on NF_CONNTRACK_IPV4, not NF_CONNTRACK.

Signed-off-by: Yasuyuki Kozakai <[e-mail]>
Signed-off-by: Patrick McHardy <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/ipv4/netfilter/Kconfig

···
 # NAT + specific targets: nf_conntrack
 config NF_NAT
 	tristate "Full NAT"
-	depends on IP_NF_IPTABLES && NF_CONNTRACK
+	depends on IP_NF_IPTABLES && NF_CONNTRACK_IPV4
 	help
 	  The Full NAT option allows masquerading, port forwarding and other
 	  forms of full Network Address Port Translation.  It is controlled by