rename dhcp_relay to dhcp

package/Config.in

@@ -31,7 +31,7 @@ source "package/bison/Config.in"
 source "package/boa/Config.in"
 source "package/bridge/Config.in"
 source "package/customize/Config.in"
-source "package/dhcp_relay/Config.in"
+source "package/dhcp/Config.in"
 source "package/distcc/Config.in"
 source "package/dnsmasq/Config.in"
 source "package/dropbear_sshd/Config.in"