Mark netatm and netnatm explicitly as requiring Giant, as they still do.

MFC after:	3 days

sys/netatm/atm_proto.c

@@ -51,6 +51,8 @@ __FBSDID("$FreeBSD$");
 #include <netatm/atm_pcb.h>
 #include <netatm/atm_var.h>
 
+NET_NEEDS_GIANT("netatm");
+
 struct protosw atmsw[] = {
 {	SOCK_DGRAM,				/* ioctl()-only */
 	&atmdomain,

sys/netnatm/natm_proto.c

@@ -56,6 +56,8 @@ extern	struct domain natmdomain;
 
 static	void natm_init(void);
 
+NET_NEEDS_GIANT("netnatm");
+
 static struct protosw natmsw[] = {
 { SOCK_STREAM,	&natmdomain,	PROTO_NATMAAL5, PR_CONNREQUIRED,
   0,	0,	0,	0,